Answer:
It helps cells make proteins.
It provides a source of water
It provides form of usable Nitrogen.
It removes carbon dioxide from the atmosphere.
It destroys harmful bacteria.
your answer is:
ocean formation
island chains
seafloor spreading
(i know i picked three but i think these are the right answers)
I believe it is the retina that changes shape to focus on distant objects.
Have a primitive digestive system
