Answer:
Photosynthesis is important to living organisms because it is the number one source of oxygen in the atmosphere. Without photosynthesis, the carbon cycle could not occur, oxygen-requiring life would not survive and plants would die. ... Without photosynthesis there would be little to no oxygen on the planet. cellular respiration is important because it provides the energy for living organisms to perform all of the other necessary functions to maintain life
Step-by-step explanation: