Why is it important to study whole ecosystems?
a. it is more interesting
c. individual pieces are independent
b. all parts of an ecosystem are interdependent
d. only the primary producers are important

Which statement is the best summary of the model? a-a series of aerobic and anaerobic reactions take place in cells b- the sun's energy moves through trophic levels in a food chain c-light energy is converted into stored chemical energy plants.d- food molecules are broken down in the cells if living things.