In the carbon-oxygen cycle, carbon dioxide is used for _____ and oxygen is used for _____.
respiration, photosynthesis
ozone, respiration
photosynthesis, respiration
evaporation, condensation
The correct answer from the choices presented above is the one from the third option. In the carbon-oxygen cycle, carbon dioxide is used for photosynthesis especially for plants and oxygen is used for respiration by humans and animals.
