There are two, two-sided dishes in the pillbug experiment. In one dish, you should have placed sand in both sides. In the other dish, you should have placed in one side and in the other.

The correct answer is "sand, cornstarch".

Explanation:

Two basic criteria that must be included in any experiment is using a control and test one variable at a time. In this case, the behavior of pill bugs in cornstarch is going to be studied. The dish serving as control will have sand in both sides. And the dish serving as the experimental approach must have sand in one side and cornstarch in the other. By having this configuration this dish serves as the focus of the study, including the variable (cornstarch) and the control (sand).

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.