Name the structures in our cells where respiration takes place

What is thought to have caused the mass extinction at the end of the cretaceous period?

What would happen if the tubing with the yellow band was placed in a beaker of distilled water?

Approximately percent of the energy created by cell metabolism is used by the body to carry on its normal functions, such as respiration, digestion, reproduction, muscular movement, circulation, and cellular regrowth.