How environmental conditions influence modern history?
Plz it’s 7th grade science

The subphase of mitosis in which the chromosomes become visible and attach to the spindle apparatus is the prophase.

Mitosis is a process of cell division that consists of several distinct stages or subphases. The prophase is the initial subphase of mitosis and marks the beginning of chromosome condensation and spindle formation.

1. Interphase: Before mitosis, the cell undergoes a period of growth and DNA replication known as interphase. During this phase, the genetic material is duplicated, resulting in two identical copies of each chromosome called sister chromatids.

2. Prophase: As mitosis begins, the chromatin fibers start to condense, becoming more tightly coiled and visible under a microscope as individual chromosomes. The chromosomes become distinct and can be observed as highly compact structures. Meanwhile, the spindle apparatus, composed of microtubules, starts to form. The centrosomes move to opposite poles of the cell, and spindle fibers extend between them.

3. Prometaphase: Following prophase, the cell enters prometaphase. In this stage, the nuclear envelope disintegrates, allowing the spindle fibers to interact with the chromosomes. Specialized protein structures called kinetochores form on the centromeres of each chromosome, and the spindle fibers attach to the kinetochores.

4. Metaphase: During metaphase, the chromosomes align along the equatorial plane of the cell, known as the metaphase plate. The spindle fibers exert tension on the chromosomes, ensuring their proper alignment.

5. Anaphase: In anaphase, the sister chromatids separate and move towards opposite poles of the cell, pulled by the shortening spindle fibers. Each chromatid is now considered an individual chromosome.

6. Telophase: Telophase marks the final subphase of mitosis. The chromosomes reach their respective poles, and a new nuclear envelope forms around each set of chromosomes. The spindle apparatus disassembles, and the chromosomes begin to decondense.

In summary, it is during the prophase of mitosis that the chromosomes become visible as distinct structures and attach to the spindle apparatus through the formation of kinetochores on the centromeres.

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Answer:

The genotype of an organism is its complete set of genetic material, two alleles are inherited for a particular gene by your parents sex gametes (sperm + egg). the genotype determines the persons phenotype eg. polydactyly, your eye colour etc, with a recessive or dominant allele. this can be determined through punnet squares too.

Three raindrops that fall feet from each other can end up hundreds of miles from each other due to evaporation and wind currents.

Evaporation is the process of changing a liquid into a gas or vapor. When water droplets are in contact with air, they tend to lose energy to the air particles. The particles absorb this energy, which makes the water particles move more slowly. This makes it difficult for the particles to stay together, and they start to break apart and escape into the air as water vapor.

Evaporation happens when the liquid absorbs enough energy to transform from its liquid state to a gaseous state. The energy is usually supplied by heat, light, or the movement of air or wind. Wind currents are produced by the uneven heating of the Earth's surface by the sun. These currents are most common near the Earth's equator because the sun's rays are most direct here and the heating is most intense.

As hot air rises, cooler air rushes in to replace it, creating a wind system. When wind currents pick up water vapor, they carry it away from the source of the evaporation. As the water droplets rise, they cool and begin to condense, forming clouds. When the clouds become saturated, the water droplets begin to fall to the ground as rain. The raindrops can fall hundreds of miles away from the original source of the water vapor due to the movement of wind currents.

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Answer:

the answer is true

Explanation: i got it right on edge.

Answer:

true

Explanation:

After 20 generations, assuming no migration, mutation, or natural selection, the allele frequencies will remain the same as those calculated after 10 generations.

What is Frequency?

Frequency is the number of occurrences of a repeating event per unit of time. It is commonly used in physics, mathematics, and engineering to describe the rate of oscillations, vibrations, or waves, as well as the number of cycles or rotations per unit of time. In genetics, frequency refers to the proportion of a particular allele or genotype in a population, and it is an important parameter for studying evolution and inheritance patterns.

After 10 generations, the allele frequencies for each habitat can be calculated as:

Short turf:

N frequency = (36 x 2 + 48) / (100 x 2) = 0.6

n frequency = 1 - 0.6 = 0.4

Rough vegetation:

N frequency = (16 x 2 + 48) / (100 x 2) = 0.4

n frequency = 1 - 0.4 = 0.6

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Based on the provided hint, in order to determine whether a tall pea plant is homozygous or heterozygous for tall height, the other contributing parent genotype must be heterozygous for tall height.

In the example about dog deafness, it was explained that the deafness in dogs is a recessive trait, and the deafness genotype is dd.

If a deaf dog is crossed with a hearing dog, the deaf dog must be homozygous for the deafness allele (dd), and the hearing dog must be heterozygous (Dd) for the deafness allele in order to determine whether the offspring will be deaf or not.

Similarly, in order to determine whether a tall pea plant is homozygous (TT) or heterozygous (Tt) for tall height, it must be crossed with a pea plant that is known to be heterozygous for tall height (Tt).

If the offspring are all tall, the tall parent is likely homozygous (TT) for tall height. If the offspring are a mix of tall and short plants, the tall parent is likely heterozygous (Tt) for tall height.

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Answer:

The human body contains following body cavities known as The dorsal body cavity (vertebral cavity), ventral body cavity (thoracic cavity, abdominal cavity, pelvic cavity

The brain - vertebral cavity of the dorsal cavity

Lungs - thoracic cavity

Liver - abdominal cavity

Bladder - abdominal cavity

Spinal cord - vertebral cavity

Heart - thoracic cavity

Ovaries - Pelvic cavity

Uterus - Pelvic cavity

Esophagus - abdominal cavity

Small intestines - abdominal cavity

Pancreas - abdominal cavity

Answer:

A, B, C, and F

Explanation:

Covalent bonds are strong bonds in which electrons circling the atomic nucleus are shared. The nature of the covalent bond is determined by the number of electrons shared and the nature of the two elements sharing the bond.

Answer:

Chemical bonds are the forces of attraction that tie atoms together. Bonds are formed when valence electrons, the electrons in the outermost electronic “shell” of an atom, interact. The nature of the interaction between the atoms depends on their relative electronegativity.

Explanation:

Within certain synovial joints, the fibrocartilaginous pads that cushion and guide the articulating bones are called menisci .

Synovial joints are the joints that are the most common type of joints found in our body. Synovial joints are different from fibrous and cartilaginous joints since synovial joints have a joint cavity that separates the articulating surfaces of the bones. Synovial joints provide a greater range of motion than other types of joints.

Fibrocartilaginous pads are pads that are present in joints to aid in articulating movement. These pads are made up of dense connective tissue that is rich in collagen. Fibrocartilaginous pads are also called "Menisci" in joints. They are present in certain synovial joints to cushion and guide the articulating bones.

Menisci are crescent-shaped fibrocartilaginous structures present in joints, particularly the knee joint. Their function is to help distribute the load across the joint and reduce friction between the articular surfaces, acting as shock absorbers.

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Answer:

One potential explanation is that humans are the only creatures that are self-aware. This self-awareness enables humans to reflect on their lives and make choices about how to live. Additionally, humans have the capacity for language, which allows them to communicate their thoughts and experiences to others. This capacity for language also allows humans to learn from others and share knowledge. Finally, humans have the ability to create and use tools, which gives them the power to manipulate their environment and greatly affects the way they live.

1. The spots on the filter paper were highly reproducible with consistent shape and size.

2. Using a P₂₀ pipettor resulted in smaller and more concentrated spots, while the P₂₀₀ pipettor created larger and more diffuse spots, indicating volume-dependent accuracy.

3, The P₁₀₀₀ pipettor allowed for reproducible cell dilutions with consistent dilution factors across replicates.

1. The spots on the filter paper were highly reproducible. Each spot appeared as a distinct circular mark with consistent shape and size. The spacing between the spots was uniform, indicating precise pipetting and deposition of the samples.

2. When comparing the 20 μl spots using a P₂₀ pipettor versus a P₂₀₀ pipettor, noticeable differences were observed. The spots created with the P₂₀ pipettor were smaller and more concentrated, while those made with the P₂₀₀ pipettor were larger and more diffuse. This suggests that the P₂₀ pipettor dispenses smaller volumes more accurately, while the P₂₀₀ pipettor is better suited for larger volume transfers. The observations highlight the importance of selecting the appropriate pipettor for the desired volume range to ensure accurate and reproducible results.

3. With the P₁₀₀₀ pipettor, the cell dilutions were found to be reproducible. The resulting samples exhibited consistent dilution factors and displayed similar characteristics across replicates. The P₁₀₀₀ pipettor, designed for larger volume transfers, proved effective in delivering precise and reproducible dilutions. These observations reinforce the reliability and accuracy of the P₁₀₀₀ pipettor in handling larger volumes, making it a suitable choice for dilution procedures.

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Eggs > legumes > grains are the protein-rich foods that are included in Vicky's new Lacto-Ovo vegetarian diet and are well-digested and absorbed.

Therefore, eggs > legumes > and grains are the protein-rich foods that are included in Vicky's new Lacto-Ovo vegetarian diet and are well-digested and absorbed.

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Answer:

Auxins

Explanation:

Auxin is a plant hormone that has to do with both leaf and fruit fall.

Answer:

There are many components that make-up a cell membrane including a mixture of lipid, proteins, molecules, and carbohydrates,

Sarah is undertaking studies on the function of part of the brain. For each participant, she first gets a excessive-decision picture of his or her mind shape using a(n) MRI.

Based totally at the photo, she locates the area she is inquisitive about, and then she quickly interrupts brain pastime in the place by using the use of a robust magnet within the form of a(n) TMS.

MRI (Magnetic Resonance Imaging) is a non-invasive medical imaging technique that uses a strong magnetic field and radio waves to create detailed images of the inside of the body. It is commonly used to visualize internal structures such as the brain, spine, joints, and organs.

During an MRI, the patient lies on a table that slides into a cylindrical tube surrounded by a magnet. The magnet causes the hydrogen atoms in the body's tissues to align in a certain direction. Radio waves are then directed at the area of interest, causing the hydrogen atoms to release energy, which is measured by sensors and used to create detailed images of the body.

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Complete Question: -

Sarah is conducting research on the function of part of the brain. For each participant, she first gets a high-resolution image of his or her brain structure using a(n) _______. Based on the image, she locates the region she is interested in, and then she temporarily interrupts brain activity in the region by using a strong magnet in the form of a(n) _______.

A person with a malfunctioning thyroid gland may experience a variety of symptoms.

The thyroid gland produces hormones that regulate metabolism and growth. If the gland produces too much or too little of these hormones, it can cause a range of symptoms.

Hypothyroidism, or an underactive thyroid gland, can cause fatigue, weight gain, constipation, dry skin, hair loss, sensitivity to cold, depression, and muscle weakness. Hyperthyroidism, or an overactive thyroid gland, can cause weight loss, rapid heartbeat, sweating, anxiety, irritability, tremors, and difficulty sleeping.

If someone is experiencing any of these symptoms, it is important to seek medical attention to determine if the thyroid gland is functioning properly. A healthcare provider may order blood tests and other diagnostic tests to determine the cause of the symptoms and develop an appropriate treatment plan.

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Answer:

How about

Explanation:

we like

DON'T :DDD

Just kidding. Well, we could use electric cars and try to reduce the time we waste just sitting in our cars/vehicles to preserve our gas and also it helps the atmoshpere.

Answer: Products

Water - H2O

Dihydrogen Monoxide Dihydridooxygen [OH2] HOH Hydrogen Hydroxide Dihydrogen Oxide Oxidane Hydrogen Oxide

Explanation:

Answer:

When temperature and wind speed are constant, but humidity increases, the rate of evaporation will decrease. When wind speed and humidity stay constant, and temperature increases, then the rate of evaporation will increase because warmer air can hold more water vapor than colder air.

Answer:

if the rate of evaporation reduces water cylcle will stops and amount of water present in the world will be increase.humifity will be more.

The role of beneficial bacteria in the large intestine is to metabolize undigested food and make some vitamins and neurotransmitter. Therefore, the correct option is A and D.

Neurotransmitters are the chemical substances that are produced  by the neurons of the nervous system of the body to transmit and receive messages.

Beneficial bacteria in the large intestine play a crucial role in human health by helping to metabolize undigested food components such as fiber and complex carbohydrates.

They also produce several vitamins and neurotransmitters, such as vitamin K, biotin, and serotonin, that are important for various physiological functions in the body. Therefore, the correct option is A and D.

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The question is incomplete, but most probably the complete question is,

The role of beneficial bacteria in the large intestine is to .

A. metabolize undigested food

B. decrease the amount of antibodies produced

C. increase the activity of disease-causing bacteria

D. make some vitamins and neurotransmitter

Answer:

With a capital letter.

Explanation:

Dominant traits are represented with capital letters like "HH" while recessive are represented with lowercase , "hh."

Answer: The option with the correct order is D and it includes:

--> sperm reaches ovum,

--> zygote is formed,

--> implantation occurs

--> zona pellucida dissolves,

--> and the embryo begins secreting hCG.

Explanation:

In humans, the male ejects sperms with great force into the cervix and the upper part of the vagina of the female. The sperms move rapidly through the cervix and the uterus into the upper part of the oviduct ( the fallopian tube) where it REACHES THE OVUM.

There are follicle cells and the zona pellucida which surrounds the ovum. The acrosomal lytic enzymes in the head of the sperm can dissolve the cell wall and membranes. They help the sperm to move through the follicle cells that surrounds the ovum and penetrate the zona pellucida of the ovum. The sperm them moves into the ovum. The nucleus of the sperm fuses with that of the ovum to FORM A DIPLOID ZYGOTE.

The zona pellucida undergoes some changes that prevents other sperm from penetrating the ovum. It continues to protect the zygote as it travels through the fallopian tube to the uterus, the site for implantation. Around 72 hours after fertilization, IMPLANTATION OCCURS and the ZONA PELLUCIDA FRAGMENTS AND DISSOLVES.

Soon after implantation, the embryo begins secreting Human chorionic gonadotrophin (HCG) through the trophoblast cells which surround the developing embryo. It is the embryonic hormone that ensures the corpus luteum continues to produce progesterone throughout the first trimester of pregnancy.

When a child is born with a faulty gene that causes a serious disease, it means that they have inherited a mutated gene from one or both parents. The mutated gene contains incorrect or incomplete instructions for making a protein, which can cause a variety of problems in the body. The severity of the disease depends on the specific gene that is affected and the degree to which it is mutated.

Some faulty genes can cause diseases that are present from birth, while others may not cause symptoms until later in life. In some cases, a person may inherit a faulty gene but not develop the disease themselves, while still being a carrier of the gene and able to pass it on to their children.

Answer: a child born with faulty gene that causes a serious disease is result of "gene change or a mutation"

Explanation:

Gene change cane sometimes cause health conditions such as cystic fibrosis and sickle cell disease. A gene change also can cause birth defects, like heart defects. A gene can change on its own or it can be passed from parents to children.

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Answer:

Population density naturally varies a great deal within each country according to climatic conditions, topography, mineral deposits, rainfall, soil cultivation, etc

To measure small liquid samples, the most accurate elements are graduated cylinders that have the most precise scale on them. Among the options, we should choose the one with more etchings.

When working with liquids, we need to be precise, so we should choose a material that provides us with the necessary to make an accurate measure.

First, we need to choose a graduated element, which means that lines on it will indicate the amount of liquid on it.

Now, in the laboratory, several elements are graduated. So to take an accurate measure, we need to choose the correct one. To do it, we need to consider our sample size (large or small sample).

For instance, beakers or flasks should not be used to measure small liquid samples because they do not have a precise measuring scale.

These glasswares are prepared only to make crude measurings. So unless your sample is too large, it is not recomended to use them.

However, if our sample is small, we can use other appropriate elements instead. Among them, we can mention graduated cylinders and pipets, volumetric pipets, or burets.

These graduated or volumetric elements have rules with many etchings that can be used to make more precise measurements.

The more etchings there are in the element, the more precise it is, and the more accurate the liquid measure will be.

Note: Since I do not have the image of the graduated cylinders, I advise you to consider your sample size, and if it is a small one, then you should chose the cylinder with more etchings, which will be the most accurate one to take the measures.

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Answer:

B

Explanation:

We need oxygen to breathe and water because there are oxygen particles in water.

A

Explanation:

Cellular respiration occurs in living cells. It provides energy to the cell for carrying out its metabolic activities. Glucose and oxygen are the reactants and the end products are carbon dioxide and water with the liberation of energy in form of ATP.

Glucose is energy in form of ATP molecules.

Answer:

Lipids

Explanation:

I think lipids are the answer.

Answer:

The green algae and land plants form a monophyletic lineage (the chlorophytes) that contains both protistan and higher taxa (Graham, 1996). An important issue regarding the evolution of this green lineage that still remains in question is the identity of the green algal (i.e. flagellate) ancestor of land plants.

Answer: B to produce new plants

Explanation: Flowers are the reproductive structures of flowering plants. They produce pollen, which contains the male reproductive cells, and they also have structures called ovaries that contain the female reproductive cells.  When pollen from the male part of a flower reaches the female part of the same flower or another flower of the same species, fertilization occurs, leading to the production of seeds.

Fruits, on the other hand, develop from the ovaries of flowers after successful fertilization.  They serve as protective structures for the developing seeds. Fruits are often colorful and fleshy to attract animals, which eat the fruits and disperse the seeds through their digestive systems or by carrying them to different locations. This dispersal mechanism helps plants colonize new areas and increases their chances of survival and reproduction.

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