Question

what process makes the oxygen we breathe?
photosynthesis
cellular respiration
question 4
what process releases chemical energy (atp)?
cellular respiration
photosynthesis

Explanation:

1. Photosynthesis in plants uses light - energy to convert carbon dioxide and water into glucose and oxygen, which is the source of the oxygen we breathe.
2. Cellular respiration is the process by which cells break down glucose to release chemical energy in the form of ATP.

Answer:

Question 1: photosynthesis
Question 2: cellular respiration