At which stage of respiration does the co2 release take place?

The process by which most living cells generate energy during the process of aerobic respiration. CO2 release takes place at the stage of krebs cycle.

So according to above explanation

Krebs cycle , is the correct answer

1) the mayans built pyramids just like the egyptians. the mayans also used hieroglyphics like them.2) power was passed down by family. for example, if the father dies, the son would be the next king.3)they both built pyramids for their structures.4)the main crop for the mayans was maize.5)they also grew manioc, beans,  squash,  amaranth, and chile peppers.