Explain A) Photosynthesis is responsible for providing the oxygen needed for all life forms on Earth.

B) Carbon dioxide and oxygen are exchanged by organisms through these two processes: photosynthesis and cellular respiration.

C) Cellular respiration, through the breakdown of glucose, supplies the oxygen needed for aerobic metabolism by most organisms on Earth.

D) Photosynthesis is responsible for the transformation of solar energy into usable chemical energy, glucose, used by most organisms on Earth