Answer:

C Po pa brain list

Explanation:

pls indeed more points

Answer:

A.Carbon Dioxide

Explanation:

Plants and animals are the two primary systems in the biosphere's cycle of life, with plants "exhaling" oxygen through photosynthesis and animals inhaling oxygen through the lungs and exhaling carbon dioxide as a byproduct. Plants require carbon dioxide to live and flourish with their end-product again becoming oxygen.