I believe the answer is C. E. And F.
Perception of pitch and sound intensity is the cocklear
They both need nutrients and are able to reproduce
Evolution would least likely be a cause of natural selection.
Natural selection has to do with the survival of the fittest. Therefore, adaptation, variation, and overpopulation all have an impact on natural selection - those who do not adapt to their new surroundings due to overpopulation or those whose bodies have not modified enough will not survive.
