Which structure of the cell controls what goes in and comes out of the cell?

cell membrane

Explanation: The cell membrane is a structure that prevents the cell from deforming. It keeps the cell in it's boundaries. This prevents particles from the outside of the cell and inside from moving. The answer is cell membrane.

the correct answer is: b. pantala flavescens, because these organisms would have a high level of genetic variation due to sexual reproduction.  

because involves two organisms (parents) whose genetic material combines, sexual reproduction leads to genetic variation in new generations of offspring. the offspring is an unique organism, with new genome, more protected with the higher ability to adapted. this process is fundamental to evolution.