Where do we humans get the carbon that we need to build our bodies?

Humans obtain carbon primarily from the food we eat, which includes carbohydrates, proteins, and fats. These macromolecules are composed of carbon atoms derived from the carbon dioxide (CO2) in the atmosphere that plants absorb during photosynthesis. Through the food chain, we consume plants or animals that have incorporated this carbon into their biological structures, allowing us to build and maintain our bodies. Additionally, carbon is also obtained from other sources like beverages and processed foods.