Why did animal life originate in the oceans rather than on the land?
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First of all there was the primordial soup which was amino acids combining to for proteins and eventually life which required oceans as the medium https://youtu.be/Kq3Os00pPJM then eventually you got cyanobacteria which could produce oxygen and photosynthesise https://youtu.be/ile60Q3zsMU from that you have the oxygen that “animals” can use and they can evolve from cyanobacteria to eat cyanobacteria.
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