The process of cellular respiration
a. occurs only in animals.
b. breaks down food molecules to release stored energy.
c. must occur before plants are able to carry out photosynthesis.
d. is performed only by organisms that are incapable of photosynthesis.

What's wrong with this ecological pyramid? (multiple choice)1. secondary consumers should be at the bottom of the pyramid2. the sun has an arrow leading to decomposers 3. primary consumers should come after the sun4. energy retained should increase from the bottom to the top5. the sun should be at the bottom of the pyramid