How does the contractile vacuole in a single celled organism.

Which of the following examples can cause gene flow between populations? a.an increase in predators to a population of zebra b.a volcanic eruption that kills half of a population of mice c.bird droppings that contain seeds from a different location d.a person that sprays a toxin on a group of mosquitoes

The first amino acid of a new polypeptide chain is

Babies with very low or very high birth weight are less likely to survive. observe a graph of the data.