Pls help question is in picture

What would happen to the nutrients in an ecosystem if decomposers, such as bacteria, didn’t exist there?

How does this experiment explain why it is often milder in areas such as coastal maryland while areas such as kansas or iowa have more extremes in temperature

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