Most of our bodies come from organic matter

Most of the organic matter in our bodies,if we trace it back far enough,comes from CO2 and water through photosynthesis.Plants use the energy from sunlight
to transform carbon dioxide and water from the environment into glucose and oxygen. That glucose is then transformed into more complex organic molecules
to form leaves, stems, roots, fruit, and so on.The energy stored in these organic molecules supports the food chains with which we're familiar. You've probably seen illustrations like this or this.