A population of organisms must exist. There must be variation among the members of the population. There must be a mechanism by which some members of the population can produce more offspring than other members. There must be a mechanism by which the variation among members of the population is passed on to their offspring.
Answer:
D
Explanation:
Just remember immigration the i= into
emigration the e=exit
Hope this helps??
A concentration gradient must exist. hope this helps
Answer:
C
Explanation:
Cholesterol molecules stay in between fatty acid tails preventing them from sticking together
