(30 points) Mosquitoes can carry and transmit many diseases to humans. In the past, the insecticide DDT was heavily used to reduce mosquito populations in order to reduce instances of disease transmission. However, after some time, mosquito populations developed a resistance to DDT, which made the DDT less effective in reducing mosquito populations.

Based on what you’ve learned about natural selection, in 3–5 sentences, describe how mosquitoes may have come to develop this resistance.

All - growth, exchange of gases, excretion, reproduction, and death (option d).

All living organisms undergo various life processes to maintain their existence. Let's analyze each option to determine which life processes are carried out by an organism's cells:

A. Only growth and exchange of gases: While cells are involved in growth and exchange of gases, they also participate in other life processes. This option is incomplete.

B. Only growth, exchange of gases, and reproduction: Cells play a crucial role in reproduction as they are responsible for the production of gametes and the process of cell division. However, there are additional life processes that cells also undertake.

C. Only growth, exchange of gases, excretion, and reproduction: This option includes excretion in addition to growth, exchange of gases, and reproduction. Cells participate in excretion by eliminating waste materials. However, there is one more life process that cells experience.

D. All - growth, exchange of gases, excretion, reproduction, and death: This option encompasses all the mentioned life processes. Cells are involved in growth as they undergo cell division and increase in number. They exchange gases through processes like respiration. Cells excrete waste products. They participate in reproduction through the formation of gametes and cell division. Lastly, cells also experience death as they have a limited lifespan.

Therefore, the correct answer is D. All - growth, exchange of gases, excretion, reproduction, and death.

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A gene is a section of a chromosome that codes for a specific trait. The specific combination of alleles, an organism possesses is called its genotype. The genotype affects the organism's phenotype.

The observable physical and functional characteristics resulting from the interaction between its genotype and the environment. In other words, the phenotype is the outward expression of the genotype. For example, an individual may have a genotype for blue eyes, but the actual eye color (phenotype) could be influenced by other genetic factors or environmental conditions.

This relationship between genotype and phenotype plays a crucial role in the study of genetics, as it helps scientists understand how genetic variations contribute to individual differences in traits, susceptibility to diseases, and response to treatments. By understanding the link between genotype and phenotype, researchers can better predict and develop treatments for various genetic disorders and diseases, as well as gain insight into the complex interplay between genes and the environment. So therefore the genotype affects the organism's phenotype.

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The maximal population of some bacterial species at the end of the log phase can reach a density of 10 to 30 billion cells per milliliter under ideal circumstances.

Since the very beginning of life on Earth, bacteria have existed.

There is strong evidence that bacteria have existed since the early Precambrian Period, or roughly 3.5 billion years ago, as evidenced by the discovery of fossilized bacteria in rocks from the Devonian Period (419.2 million to 358.9 million years ago).

At least since the Paleoproterozoic period, which lasted for around 1.8 billion years, when oxygen was produced by cyanobacteria and entered the atmosphere, bacteria have been present in large numbers on Earth.

As a result, bacteria have had plenty of time to evolve into a variety of offspring forms and adapt to their environs.

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The fundamental goal of environmental monitoring is to control and reduce the negative effects that an organization's operations have on the environment.

The system's internal status and surrounds are revealed via environmental factors. Transmission rate, SNR, and BER all provide information on the internal status. The channel occupation and channel response are two examples of environmental information for the system.

Environmental monitoring is a method for evaluating environmental trends and conditions, assisting in the creation of policies and their execution, and gathering data to present to the public, national politicians, and international organizations.

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Answer:

Photosynthesis

Explanation:

Plant cells obtain energy through a process called photosynthesis. This process uses solar energy to convert carbon dioxide and water into energy in the form of carbohydrates.

In a population in Hardy-Weinberg equilibrium, the frequencies of alleles and genotypes remain constant from one generation to the next, as long as no evolutionary forces are acting upon the population. The Hardy-Weinberg equilibrium equation relates allele and genotype frequencies in a population:

The correct option is B

p^2 + 2pq + q^2 = 1

where p is the frequency of the dominant allele (PTC taster) and q is the frequency of the recessive allele (PTC non-taster). The genotype frequencies are p^2 for TT (taster/taster), 2pq for Tt (taster/non-taster), and q^2 for tt (non-taster/non-taster).

Given that the taster phenotype is dominant to the non-taster phenotype, the 780 individuals who can taste PTC must be either TT (taster/taster) or Tt (taster/non-taster) genotypes. The frequency of the taster allele (p) can be estimated as follows:

p = (number of copies of T allele in the population) / (total number of copies of alleles in the population)

Since each individual has two copies of the PTC taste gene, there are 2 x 780 = 1560 copies of the T allele in the population. The total number of copies of alleles in the population is 2 x (780 + 70) = 1700. Therefore:

p = 1560 / 1700 = 0.9176

Using the Hardy-Weinberg equilibrium equation, we can solve for q:

p^2 + 2pq + q^2 = 1

0.9176^2 + 2(0.9176)(q) + q^2 = 1

Simplifying and solving for q, we get:

q = 0.2824

Therefore, the frequency of the non-taster allele (q) in the population is 0.2824 or approximately 0.28.

So, the answer is B) 0.28

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The genotypes of the couple described are AaTt for the male and AaTt for the female. Their phenotypes will depend on whether they express the recessive traits or not.

For the couple described, the male is heterozygous for both albinism (Aa) and sickle cell anemia (Tt), and the female is also heterozygous for both traits (AaTt). The genotype for each individual includes two alleles per genetic locus.

In terms of phenotypes, the presence of the dominant allele (A) for albinism means that neither the male nor the female will express the albino phenotype. Therefore, their phenotype will be non-albino.

For sickle cell anemia, the presence of the recessive allele (t) is necessary for the expression of the disease. Since both individuals are heterozygous for the sickle cell trait (Tt), they will not have sickle cell anemia. Instead, their phenotype for sickle cell will be healthy or unaffected.

To summarize, the genotypes of the couple are AaTt, and their phenotypes are non-albino and healthy for sickle cell anemia.

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Answer:

making cheese

EXPLAINATION:

During cheese production, the bacteria digest the milk sugar (lactose), producing lactic acid via fermentation

Answer:

making cheese

Explanation:

The smallest to the largest are the proton, nucleus of an atom, carbon atom, molecule of glucose, and polysaccharide. Here, the proton is present inside an atom, which is the smallest of all.

Protons are subatomic particles that is positive in nature and carry a positive charge, and the nucleus of an atom has a bigger size. Polysaccharides are complex carbohydrates that is made up of many simple units of sugar units bonded together by glycosidic bonds. They are generally larger molecules than individual glucose molecules and insoluble in water. Examples of polysaccharides include starch, cellulose, and glycogen and many more.

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The ability of certain lizards to lose their tail if attacked by a predator is an example of a protective function exhibited by physical characteristics, which are commonly referred to as adaptations.

Physical characteristics that aid organisms in their survival are called adaptations. These adaptations can be structural, physiological, or behavioral in nature. In the case of certain lizards, their ability to shed their tail when attacked by a predator is a defensive adaptation that helps them escape from potential harm.

1. Adaptations: Adaptations are traits or features that have evolved in organisms to enhance their chances of survival and reproduction. These can include anatomical structures, physiological processes, or behavioral patterns.

2. Defensive Adaptations: Defensive adaptations are specifically geared towards protecting an organism from harm. In the case of lizards, the ability to shed their tail, a behavior known as autotomy, is a defensive adaptation.

3. Autotomy: Autotomy is the self-amputation or shedding of a body part by an organism. Lizards, such as certain species of geckos or skinks, have developed the ability to voluntarily shed their tail when under attack. The detached tail continues to move, distracting the predator and allowing the lizard to escape.

4. Protective Function: The ability to lose the tail serves a protective function by allowing the lizard to survive encounters with predators. By sacrificing their tail, lizards can increase their chances of survival by diverting the predator's attention and facilitating their escape.

In summary, the physical characteristic exhibited by certain lizards, where they can lose their tail if attacked by a predator, is an adaptation that serves a protective function. This ability, known as autotomy, enhances their chances of survival by enabling them to escape from potential predators.

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The correct option is a) external iliac artery. A blockage in the external iliac artery will reduce blood flow to the femoral artery.

The external iliac artery is a major blood vessel that supplies blood to the lower limbs. It is connected to the common iliac artery, which is responsible for supplying blood to the pelvis and lower abdominal region. However, the immediate impact of a blockage in the external iliac artery would primarily affect the blood flow to the femoral artery.

The femoral artery is a continuation of the external iliac artery and is located in the thigh region. It carries oxygenated blood to the lower extremities, providing nourishment and oxygen to the leg muscles and tissues. When a blockage occurs in the external iliac artery, it restricts or reduces blood flow downstream, affecting the arteries supplied by it.

Therefore, a blockage in the external iliac artery will result in decreased blood flow specifically to the femoral artery. This reduction in blood flow can lead to compromised circulation, decreased oxygen and nutrient delivery, and potential symptoms such as pain, weakness, or tissue damage in the lower limbs supplied by the femoral artery.

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The statement "they are not regulated by contact inhibition" best describes cancer cells. Thus, the correct option is D.

A cancerous cell may be defined as a cell that stimulated continuous growth, inhibition of apoptosis, perform metastasis, etc.

Contact inhibition is performed by the noncancerous cells to cease proliferation and growth when they contact with each other. This property is lost when any noncancerous cell is transformed into a cancerous cell.

Thus, the correct option for this question is D.

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Explanation:

the action or process of fertilizing an egg involving male and female gamete to form zygote is fertilization. fertilization result in zygote.

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Answer:

The answer to your question is Grass

Answer:

C. Both are primary producers.(THIS IS THE CORRECT ANSWER)

Explanation:

Chemosynthesis is a biological conversion of carbon molecules. These are found around the hydrothermal vents.

Hence the option B both are primary producers.

brainly.com/question/19578387.

Answer:

No intercourse needed.

Explanation:

Answer:

The advantages of asexual reproduction include:

the population can increase rapidly when the conditions are favourable.

only one parent is needed.

it is more time and energy efficient as you don't need a mate.

it is faster than sexual reproduction.

Explanation:

Hope this helps u out!!

The strong acids are hydrochloric acid, larger Ka, and strong tendency to dissociate protons. The weak acids are acetic acid, partially dissociates into ions, and larger pKa*.

Depending on the initial acid, a proton (hydrogen ion) is transferred from an acid to a water molecule to form a hydroxonium ion or a negative ion. All of these reactions are reversible, but in some instances we can consider the reaction to be one-way since the acid is so effective at releasing hydrogen ions. Almost all of the acid has been ionised. When an acid is dissolved in water, it doesn't entirely ionise, making it a weak acid. A example weak acid is ethanolic acid. When combined with water, it combines to form ethanoate and hydroxonium ions, however the reverse reaction is more effective than the forward one. The acid and the water are easily reformatted by the ions.

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The complete question is:

Classify each acid or property as representing a strong or weak acid.

The sacred tree found at the Acropolis in Athens, Greece is an olive tree. The olive tree is considered sacred in Greek mythology and symbolizes peace and prosperity.

It is an important symbol in Greek culture and has been cultivated in the region for thousands of years. Greek mythology is the body of myths originally told by the ancient Greeks, and a genre of ancient Greek folklore, today absorbed alongside Roman mythology into the broader designation of classical mythology.

These stories concern the ancient Greek religion's view of the origin and nature of the world; the lives and activities of deities, heroes, and mythological creatures; and the origins and significance of the ancient Greeks' cult and ritual practices. Modern scholars study the myths to shed light on the religious and political institutions of ancient Greece, and to better understand the nature of myth-making itself.

Greece is an overwhelmingly Orthodox Christian nation – much like Russia, Ukraine and other Eastern European countries. And, like many Eastern Europeans, Greeks embrace Christianity as a key part of their national identity.

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Answer:

D .follicle

Explanation:

because those are the structure of the hairs

Answer: Follicle

Explanation:

I took the test (clever)

Answer:

2

Explanation:

My uncle; who lived on a farm said that they always had to be careful about to much runoff that usually pollutes water and I learned about that a while ago in science, so I think 2 is the most negative impact.

Answer:

Organic chemistry

Explanation:

Carbon Compunds

A gain-of-function mutation in the calcitonin receptors would cause disruptions in communication between presynaptic and postsynaptic neurons due to altered calcium regulation, potentially leading to impaired synaptic transmission.

A gain-of-function mutation in the calcitonin receptors would lead to altered communication between presynaptic and postsynaptic neurons. Calcitonin receptors are proteins found on the surface of cells that are involved in regulating calcium levels in the body. They play a role in modulating neuronal activity and synaptic transmission.
In normal circumstances, the binding of calcitonin to its receptors helps regulate calcium levels and maintain the balance of neuronal signaling. However, a gain-of-function mutation in these receptors can cause them to become overactive or hyperactive.
This increased activity can disrupt the balance of calcium and affect the communication between presynaptic and postsynaptic neurons. Calcium ions are crucial for neurotransmitter release and the transmission of signals across the synapse. Any alteration in the normal calcium levels can lead to abnormal synaptic transmission and affect the overall communication between neurons.
Therefore, a gain-of-function mutation in the calcitonin receptors could result in impaired signaling between presynaptic and postsynaptic neurons, leading to communication deficits.
In summary, a gain-of-function mutation in the calcitonin receptors would cause disruptions in communication between presynaptic and postsynaptic neurons due to altered calcium regulation, potentially leading to impaired synaptic transmission.

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Answer:

The wolves would be effected also. They would be effected by eating the elk.

Explanation:

Short term: They would eat the elk.

Long term: It would cause the wolves to get sick so they could go extienct if the dissease if that bad or they would have to stop eating elk.

Echo-sounding device are used by the oceanographers to study the distance and depth of the water to know how fast the sound waves travel.

Echo sounding is the measure of the depths using sound waves. Echo- sounders use different frequencies of sound to find out the different things present in the seafloor. Scientists typically use echo-sounders which transmit sound at the frequency of 12 kiloHertz (kHz) to determine how far down the seafloor depth lies.

The sound waves through the device travels down through the water column until they hit the seafloor where they are reflected back up to the echo-sounder. By recording the time it takes for the sound to travel down to the seafloor level and back again, it is possible to calculate the depth of the water as we know how fast the sound travels.

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Answer: dandelion is consumed by bees, grasshoppers, and butterflies.

Answer:

primary consumers, secondary consumers, tertiary consumers.

Explanation:

Hope this helps