Answer:
Hello!
Primary consumers and producers are two examples of <u>trophic</u> levels, a way to classify living organisms based on their source of nutrients.
Hope this helps!
Overgrazing is a cause of desertification, so c.
Answer:
The Cell membrane is the main source of wnergy for the cell
Explanation:
Its the ATP. Cells make use of a molecule called adenosine triphosphate, or ATP, as a source of fuel.