3. What methods are you using to test this hypothesis? Outline the steps of the procedure in full sentences.

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

Cells destroy body cells infected by a virus or bacteria.

Select the word from the list that best fits the definition a system made of 25 satellites