Answer: (1) photosynthesis occurred
Explanation: The photosynthesis process in cianobacteria changed the composition of earth's atmosphera, rising oxygen levels. This could be possible since photosynthesis used energy from the sun to produce energetic intermediaries to synthesize sugars, and as byproduct due to water photolisis, is oxygen.
4.) mumps or Mononucleosis
False. <span>Adult corals are sessile organisms, i.e. they don't move around. They are tiny organisms whose shells are what we generally see.</span>
