What would happen if photosynthesis did not occur??

If there was no photosynthesis, plants and animals likely could not exist. In addition the atmosphere would have very little oxygen because photosynthesis releases a large amount of oxygen into the air. ... Otherwise, the Earth would be a pretty barren lifeless place without photosynthesis.

Explanation:

since the atomic number is the number of protons in the nucleus, as we move to the left on the periodic table, the electrostatic pull between the nucleus and the valence electron shell decreases. as we move down a group (vertical column), the valence shell energy level gets further and further from the nucleus.

thats a little if u want the answer just look it up on google thats what i do haha : )