Question

In the oxygen–carbon dioxide cycle,
a.

animals produce oxygen used by plants for photosynthesis.
b.

animals produce oxygen used by plants for respiration.
c.

animals produce carbon dioxide used by plants for photosynthesis.
d.

animals produce carbon dioxide used by plants for respiration.

Answer 1

I believe it's D, but I'm not too sure...

Answer 2

The Carbon Dioxide- Oxygen Cycle relates to the relationship between Carbon Dioxide [CO2] breathing plants and Oxygen [O2] breathing lifeforms. All oxygen-breathing lifeforms take in Oxygen and exhale CO2. Plants take in the CO2 and use it in their photosynthesis process and in turn give off oxygen.
A: The Carbon Dioxide-Oxygen Cycle is a continuously occurring process whereby animals inhale Oxygen and then exhale Carbon Dioxide, and plants use the CO2 and "exhale" O2.
A: Plants and other producers use carbon dioxide in photosynthesis.
They produce oxygen as a waste product. Carbon dioxide moves
from the air into the leaves of plants. Oxygen moves from the
plant into the air through the leaves.