Why are iron oxides in rocks evidence for prehistoric photosynthesis?

Question

A. Iron oxides form when oxygen, a product of photosynthesis, is in the atmosphere.
B. Iron oxides form when cyanobacteria produce oxygen via photosynthesis.
C. Iron oxides form when cyanobacteria use carbon dioxide for photosynthesis.
D. Iron oxides form when carbon dioxide, a reactant of photosynthesis, is in the atmosphere.

Answer 1

I plugged the question into Google and came up with this. It answers the question completely. You will need to add the h t t p s:// in front without the spaces.
news.wisc.edu/ancient-rocks-record-first-evidence-for-photosynthesis-that-made-oxygen/

Answer 2

chemical reaction
chemical bonds
chemical bonds
C3H6O3
Iron oxides form when oxygen, a product of photosynthesis, is in the atmosphere.

100%
No one

Answer 3

No one, the third one is actually bond number not chemical bonds but the rest are correct

Answer 4

thank u thank u thank u

Answer 5

no one and lily, ur both life savers<3

Answer 6

1. chemical reaction
2. chemical bonds
3. bond number
4. C3H6O3
5. Iron oxides form when oxygen, a product of photosynthesis, is in the atmosphere.

100/100 correct