• anonymous
cyanobacteria were the first photosynthetic organisms. How were they responsible for allowing higher life forms to evolve? A:They released oxygen, which mixed to form iron, and later ferrous oxide, in the air. B: They released carbon dioxide, which evolving animals needed. C: They released oxygen, which created the ozone layer, which resulted in reduced mutation rate.
  • Stacey Warren - Expert
Hey! We 've verified this expert answer for you, click below to unlock the details :)
At vero eos et accusamus et iusto odio dignissimos ducimus qui blanditiis praesentium voluptatum deleniti atque corrupti quos dolores et quas molestias excepturi sint occaecati cupiditate non provident, similique sunt in culpa qui officia deserunt mollitia animi, id est laborum et dolorum fuga. Et harum quidem rerum facilis est et expedita distinctio. Nam libero tempore, cum soluta nobis est eligendi optio cumque nihil impedit quo minus id quod maxime placeat facere possimus, omnis voluptas assumenda est, omnis dolor repellendus. Itaque earum rerum hic tenetur a sapiente delectus, ut aut reiciendis voluptatibus maiores alias consequatur aut perferendis doloribus asperiores repellat.
  • katieb
I got my questions answered at in under 10 minutes. Go to now for free help!
  • raspberryjam
The key word here is that they are photosynthetic organisms. Do you remember the equation for photosynthesis and what it produces? Based off of that equation you should be able to find your answer :D

Looking for something else?

Not the answer you are looking for? Search for more explanations.