This seems really pity I know, but my biology course reading doesn't help answer these questions whatsoever- at least not in a way that would be easy to understand so, please help. 1) Why did 40% of the human population evolve to tolerate lactose?(1 point)

A Lactose tolerance allows people to enjoy a wide variety of food, including milk, butter, ice cream, and cheese.

B People who have an intolerance experience physical pain, so a tolerance evolved to avoid that.

C Within cultures that rely on milk-producing animals, individuals who tolerated lactose had a survival advantage.

D Babies rely on milk to survive, so they need to be able to tolerate lactose.

2) What is the difference between genetic drift and natural selection?(1 point)

A Genetic drift is the change in a population’s genes over time; natural selection is the evolution of a population over time.

B Genetic drift is the frequency of genes in a population; natural selection is the frequency of adaptations in a population.

C Genetic drift is the random increase or decrease of certain genes in a population; natural selection is not random.

D Genetic drift is the selection of random traits in a population; natural selection is the selection of specific traits.

3 What is an interferon?(1 point)

A An interferon is used by a virus to stop the body from detecting it.

B An interferon disrupts DNA replication.

C An interferon reduces the efficacy of antibiotics on bacteria.

D An interferon activates the body’s immune system response to a virus.

4 Why is there such a wide variety of immune system responses between hosts when they are infected with the same virus?(1 point)

A Slight variations due to mutations in the virus trigger different responses in people.

B People that have already been infected are asymptomatic.

C Some viruses are resistant to antibiotics, so they cause a stronger immune system response.

D Each person’s immune system employs different tactics to get rid of the virus.

5 Is the following statement true? “Antigenic drift and other mutations to the DNA of viruses are always beneficial for the virus.”(1 point)

A Yes, because mutated viruses are able to infect more hosts.

B Yes, because mutated viruses have less mRNA so they can copy and replicate faster.

C No, because mutated viruses are may be less likely to replicate.

D No, because different mutations cause a variety of immune responses.