In an ecosystem, primary consumers eat plants. Secondary consumers eat
primary consumers. Tertiary consumers eat secondary consumers.
What can be concluded from this information?
(A)
Plants need both carbon dioxide and water for photosynthesis to occur.

B. Different types of organisms within an ecosystem need each other to live.

C. Bacteria and fungi are needed to break down the dead bodies of producers
and consumers.

D Light from the sun is necessary for most ecosystems on Earth to get
going.