The chemical equation of photosynthesis includes 6o2. what does the small number after the o represent?

Last week i was assigned a thematic. we have groups of three but the people i was assigned with haven't been in school for days. i would appreciate if anyone can me with my thematic . i highlighted most of the important steps and i circled my thematic topic. in desperate need : ( its due on february 19

The kind of fertilization found in the majority of aquatic animals is (internal or external) fertilization.

Ture or false evidence for evolution includes millions of fossils