Question

1. how does carbon go from the air into a humans body?

Explanation:

Photosynthesis fixes carbon from air into plants, and human diet links to plant - based or animal - based food sources that contain carbon.

Answer:

Carbon in the air is mainly in the form of carbon - dioxide ($CO_2$). Through the process of photosynthesis, plants take in $CO_2$ from the air and convert it into organic compounds containing carbon. When humans consume plant - based foods or foods from animals that have eaten plants, they ingest the carbon - containing organic compounds, thus carbon enters the human body.