Answer: Fitness or camouflage
Explanation: C and D don’t make any sense
The answer is D. The natural selection is a theory which illustrates the gradual process of evolution in the population due to the change of environment. The key point is the mutation (variation) exists in the population before the environment changing. For C, if the environment does not change, though the adaptation is useful to environment, it will not be selected. Because the organisms without the adaptation will not die.
The dependent variable is the data we collect during the experiment. This data is collected as a result of changing the independent variable.
