Answer:
B) There are so many animals that eat them.
Step-by-step explanation:
Photosynthetic organisms are called "photoautotrophic", but not all organisms that use light as photosynthesis of an energy source effect, since "photoheterotrophic" use organic compounds, not carbon dioxide, as a carbon source. In plants, algae and cyanobacteria, photosynthesis uses carbon dioxide and water, releasing oxygen as waste.
Photosynthesis is crucial for life on Earth because, in addition to maintaining the normal level of oxygen in the atmosphere, almost all life forms depend directly as a source of energy, or indirectly as a supreme source of energy in their food.