Read the following sentence from the passage.
animals would not be able to breathe if it was not for this process.
how does this sentence to develop the idea that photosynthesis is essential to animal life?
a. it suggests that photosynthesis takes place in the lungs,
b. it shows that animals depend on this process for food.
c. it shows that animals depend on this process for oxygen.
d. it suggests that photosynthesis occurs in all animals.