Answer:
A. If conditions change, you have a greater chance of someone having adaptations that allow them to survive and reproduce.
Answer:
c
Explanation:
Natrual selection is survival of the fittest, so only the best suited for that environment survive.
There are often not more than one or two independent variables tested in an experiment, otherwise it is difficult to determine the influence of each upon the final results. There may be several dependent variables, because manipulating the independent variable can influence many different things.
