What is the broadest level of the ecological hierarchy that you will encounter in this microscopic model?

Suppose you are estimating the size of a blue crab population. what is the population size if the number marked in the first catch is 40, the total number in the second catch is 200, and the number marked in the second catch is 50?

Mike has a problem with his testosterone. he is unable to produce enough. which will most likely be affected by his inability to produce testosterone? check all that apply.

During binary fission, what events must occur before the cell splits into two new cells?