This is for bio need HELP

Compare the depth of field when focusing with low power and high power. which power has the greater depth of field?

The concept of keystone species is controversial among ecologists because most organisms are highly interdependent. if each of the trophic levels is dependant on all others how can we say one is most important

In the diagram below, the northern hemisphere would be in what season at position a a. fall b. winter c. summer d. spring