[eli5] Humans and most animals breathe in O2(dioxide) and breathe out CO2(carbon dioxide) , where does the carbon come from?

Question

[eli5] Humans and most animals breathe in O2(dioxide) and breathe out CO2(carbon dioxide) , where does the carbon come from?

In: Biology

Answer 1

This is kinda mind boggling, but science is just like that. I sometimes get confused over how trees can grow so big just from water and the minerals in the soil until I remember that they’re literally sucking carbon out of the air to build themselves with (in a very simplistic perspective)

The world is fascinating.