Q1.Tissues working together to perform specialized functions are called-
A. an organ.
B. an organism.
C. a population.
D. a cell.
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Answer: The cycle of day and night on Earth is caused by the rotation of the Earth on its axis. As the Earth rotates, different parts of the planet are exposed to the Sun's light, causing daylight in some areas and darkness in others.

Answer:

Explanation:

Considering the atmosphere of the primitive earth to have contained water vapor, carbon dioxide, carbon monoxide, methane, and ammonia and/or nitrogen, then in the presence of an energy source, such as sunlight or lightning, a number of small molecules like hydrogen cyanide, HCN, are formed.

Renewable energy sources should be included - While a sustainable city plan may already have steps to cut energy use and increase efficiency, these efforts might be strengthened by including energy sources like solar, wind, or geothermal energy.

Therefore, the following are the primary ways that cities can become more environmentally friendly: Decrease the consumption of energy and resources by increasing system efficiency, such as in transportation, and altering citizen behavior. Use leftover energy and materials and recycle them. Use cleaner sources of energy.

In order to reduce air pollution and CO2 emissions, improve air quality, and promote technology, a sustainable city idea integrates eco-friendly behaviors, green areas, and supporting

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Meiosis consists of two nuclear divisions (meiosis I and meiosis II) that reduce the number of chromosomes to the haploid number in preparation for sexual reproduction. Although the nucleus divides twice during meiosis, DNA replicates once. The products of meiosis are different from each other as well as from the parent cell. In particular, the functions of meiosis are:

1. Reduce the number of chromosomes from a diploid number to a haploid number.

2. Ensuring that each of the haploid products has one set of chromosomes.

3. Promote genetic diversity in its products. This is because the differences between haploid nuclei result from crossing over during prophase I and random segregation of homologous chromosomes during anaphase I.

The result of meiosis is 4 haploid nuclei (cells).

We can conclude that the correct answer is:

B. consists of two sets of divisions and produces four haploid daughter cells that are not identical.

The entry in the diary describes the sensation of adventure, amazement, and difficulties experienced by an explorer traversing America without access to precise charts, depending instead on instinct, cunning, and inadequate maps.

We now know that Columbus was not the first, but rather one of the last, explorers to reach the Americas. 500 years before Christopher Columbus, Leif Eriksson and his valiant group of Vikings arrived in North America and established a settlement.

The journey to India and encounters with various peoples along the shores of Africa and India are described in the paper. It talks about captives, illnesses, plants and animals, titles and occupations, weapons of battle, and nourishment.

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Based on the phenotypes obtained from the cross;

a. The expected proportion of pink flowers among the offspring would be 50%.

b. The expected proportion of pink flowers among the offspring would be 50%, while the expected proportion of white flowers would be 50%.

The phenotypes for the given crosses are determined as follows:

a. R₁R₂ x R₁R₂ = R₁R₁ , R₁R₂, R₁R₂, R₂R₂

The offspring of this cross would be 2/4 heterozygous R₁R₂, which would result in pink flowers. The expected proportion of pink flowers among the offspring would be 50%.

b. R₁R₂ x R₂R₂ =  R₁R₂,  R₁R₂, R₂R₂,  R₂R₂

The offspring of this cross would be either heterozygous R₂R₂ or homozygous R₂R₂, which would result in either pink or white flowers, respectively. The expected proportion of pink flowers among the offspring would be 50%, while the expected proportion of white flowers would be 50%.

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Complete question:

Red-flowering snapdragons are homozygous for allele R¹. White-flowering snapdragons are homozygous for a different allele (R2). Heterozygous plants (R¹R²) bear pink flowers. What phenotypes should appear among first-generation offspring of the crosses listed? What are the expected proportions for each phenotype?

a. R¹R2 x R1 R2 b. R¹R2 x R2R2

Answer:

Greater

Explanation:

When the Sun and Moon are lined up (at new moon or full moon), the tides produced reinforce each other and are more significant than average (Figure 4). These are called spring tides (the name is connected not to the season but to the idea that higher waves “spring up”).

Answer:

The tides are higher than normal!

Explanation:

During dialysis, diffusion facilitates the movement of waste products and excess fluids out of the blood, restoring homeostasis.

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Explanation:

RNA growth is always in the 5′ → 3′ direction: in other words, nucleotides are always added at a 3′ growing tip, . Because of the ANTIPARALLEL nature of the nucleotide pairing, the fact that RNA is synthesized 5′ → 3′ means that the template strand must be oriented 3′ → 5′.

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Embryonated chicken eggs represents an in vivo method for cultivating viruses. (option c)

To cultivate viruses in a living system, an in vivo method is used. Among the options provided, embryonated chicken eggs are the most commonly used method for culturing viruses in a living organism.

HeLa cells: HeLa cells (a) are human cancer cells commonly used in laboratory research, but they are not a living organism suitable for virus cultivation.

Pure bacterial cell cultures: Bacterial cell cultures (b) are often used to study bacteriophages, which are viruses that infect bacteria. However, this method involves culturing viruses in bacterial hosts and does not involve a living organism.

Embryonated chicken eggs: Embryonated chicken eggs (c) are a widely used method for virus cultivation. In this method, viruses are injected into the developing embryo, which provides an environment for viral replication. The embryos provide a controlled and nutrient-rich environment for the viruses to grow and propagate.

Lung cell culture: Lung cell culture (d) involves growing lung cells in a laboratory setting. While this method can be used to study certain viruses, it is an in vitro (outside a living organism) method rather than an in vivo method.

In conclusion, the in vivo method for cultivating viruses among the options provided is embryonated chicken eggs. This method provides a living system in which viruses can replicate and propagate. (option c)

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Answer:  the answer is c

Explanation:

Different types of cells occurs in organisms. These cells differentiate right from the zygote stage to become more specialized as the individual grow.

The two classes of cells found in the human body include the sex cells and somatic cells (option C).

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Answer:

The correct chronological order of the stages of planet formation are differentiation, cratering, flooding, and surface evolution.

Answer:

A

Explanation:

Answer:

Sponges are a very much important to this biological world. They are very much important in nutrient cycles in the coral reef systems and highly help in supporting the marine food web. Economically they are treated as protective habitats for animals like crustaceans, molluscs, small fishes, etc.

Explanation:

The concepts of phenotype and genotype are related to genetics.

The phenotype is generally called the external appearance of the living thing, which is formed by the genetic information and environmental effects.

Genotype is the genetic information that an organism carries in its DNA.

For example; Character A is the favorite black color. a is the blue color character.

While the Aa display shows the individual with black eyes in the phenotype, the genotype is expressed as heterozygous dominant black eyes.

Answer:

C

Explanation:

plants use solar energy they can't get chemical energy because they can't eat like people

people use chemical energy to sustain themselves

Answer:

I believe the answer is ribosome

Explanation:

Hope this helps :)

Answer:

The answer I think is

Explanation:

Nucleus

By being a good human being, following moral values we can build a good society.

Economy is growing, GDP is flawed. Wars an Natural disasters are good for GDP. Aristotle in order to make good society, he said, the society must create the pre-conditions. For him the good society was the one that created the conditions for what he calls "Eudaimonia", which means flourishing or thriving.

First are the basic needs of humans that is Food, Shelter, Water and Secondly the amenities for building a successful and good lifestyle and better life.

Moreover, every individual should have freedom to speech, fundamental rights, an attitude of gratitude as well. A person should be a giver, a giver to needy ones, giver of happiness that is spreading happiness, rather than negativity.

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Answer:

non of the above

Explanation:

cause the only animal that doesnt need a gall bladder is a horse

Answers:

Column A : Column B

1 : C

2 : B

3 : A

Galapagos finches are a group of 14 species of birds found on the Galapagos Islands in the Pacific Ocean. They are best known for their diversity in beak shape, which has been attributed to natural selection.

The finches have evolved over time to adapt to their environment, displaying a wide range of beak shapes, sizes, and feeding behaviors in order to access different food sources.

1. "Galapagos Finches: Evolution Through Natural Selection." National Geographic, National Geographic Society, www.nationalgeographic.org/encyclopedia/galapagos-finches-evolution-natural-selection/.

2. Grant, Peter R. Evolutionary Dynamics of a Natural Population: The Large Cactus Finch of the Galapagos. Princeton University Press, 2003.

3. Grant, Peter R., and B. Rosemary Grant. How and Why Species Multiply: The Radiation of Darwin's Finches. Princeton University Press, 2008.

4. "Galapagos Finches." Encyclopedia Britannica, Encyclopedia Britannica, Inc., www.britannica.com/animal/Galapagos-finch.

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The population density of the 900 sheep in the given plot of land is 150 sheep per square kilometer.

The population density of 900 sheep in a plot of land that is 3.00 km by 2.00 km can be calculated by dividing the total number of sheep by the area of the land.

First, we need to calculate the area of the land. The area can be found by multiplying the length and width of the plot of land:

Area = length × width = 3.00 km × 2.00 km = 6.00 km²

Next, we divide the total number of sheep by the area to calculate the population density:

Population Density = Total number of sheep / Area = 900 sheep / 6.00 km²

Performing the calculation, we find:

Population Density = 150 sheep/km²

Therefore, the population density of the 900 sheep in the given plot of land is 150 sheep per square kilometer.

Population density is a measure of the number of individuals (in this case, sheep) per unit area. By dividing the total number of sheep by the area of the land, we obtain the population density in terms of sheep per square kilometer. In this case, the population density is 150 sheep/km², indicating that there are, on average, 150 sheep within each square kilometer of the land.

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The force exerted by blood inside the arteries is known as blood pressure. It differs depending on where on the body the person is.

As a result, it is always measured in the upper arm artery, the largest artery in the upper arm. Our blood is descending due to gravity. Gravity pulls the blood downhill, thus as you lift or lower your arm, the blood volume at the height of the cuff changes slightly yet significantly. Sit in a chair with your feet flat on the ground while holding your arm up so your elbow is roughly at heart level in Blood pressure. The cuff's inflatable portion ought to completely encircle at least 80% of your upper arm.

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A potential realistic mutation that could greatly benefit the human race is an increased resistance to infectious diseases.

One potential realistic mutation that could greatly benefit the human race is an increased resistance to infectious diseases. Such a mutation could occur through various mechanisms, including natural selection, genetic engineering, or epigenetic modifications.

This mutation would be beneficial because it would improve the health and well-being of individuals, reduce healthcare costs, and potentially prevent pandemics and global health crises. For example, a mutation that enhances the activity of immune cells or increases the expression of antimicrobial peptides could help individuals fight off infections more effectively and reduce the likelihood of spreading infectious diseases to others.

However, it is important to note that there could be potential negative consequences associated with this mutation. For instance, increased resistance to infectious diseases could lead to a reduction in the diversity of the human microbiome, which could have implications for overall health and immune function.

Additionally, it is possible that infectious agents could evolve in response to this mutation, potentially leading to the emergence of new and more virulent strains of pathogens. Therefore, it is important to consider the potential risks and benefits of any mutation carefully and to approach genetic engineering with caution.

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The correct answer is A. Feedback mechanisms and homeostasis are closely related in that feedback mechanisms help to maintain homeostasis in living organisms. (option-a)

Homeostasis is the process of maintaining a stable internal environment despite external changes. Feedback mechanisms are the physiological responses of an organism to maintain this stability. For example, if the body temperature drops, the feedback mechanism in the body responds by shivering to generate heat and maintain the internal temperature. Similarly, if the body temperature rises, the feedback mechanism in the body responds by sweating to cool down and maintain the internal temperature. In both cases, the feedback mechanism works until the internal conditions return to normal, thereby maintaining homeostasis. Therefore, feedback mechanisms are essential for the maintenance of homeostasis in living organisms.(option-a)

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Answer:

I believe it is E.

Explanation:

'The phenotype of a heterozygote is not the same as either parent, but it is somewhere between the two parents' is a direct definition of Incomplete Dominance.

Answer:

La globalización hace más vulnerable la economía al cambio climático. La susceptibilidad de la red económica global al estrés por calor de los trabajadores se ha duplicado en la última década, según concluye un nuevo estudio publicado en la revista 'Science Avances'

Explanation: