Question

Many animals exhale carbon dioxide, CO2, as a waste product, but plans need CO2 to
live.

Answer 1

All animals exhale carbon dioxide i.e. co2 but plants need co2 to live because co2 helps in the process of photosynthesis to produce carbohydrate and oxygen.

6CO2 + 6H2O → C6H12O6 + 6O2.