Why did animal life originate in the oceans rather than on the land?
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Many chemical reactions require water. The very beginnings of life, essentially the first cells are basic chemical reactions that must happen in water.
Among the many reasons other posters have stated, I think simply water being the medium is the most important to the origin of life.
[In chemical reactions, water can act in many ways. Some of these include as a hydrogen bond donor or acceptor, as well as a proton (H+) donor or acceptor, which allows water to facilitate reactions in many ways.
Most importantly, water acts as a solvent in many chemical reactions. In many chemical contexts, the chemical reaction does not take place without water. Here, water allows these reactions to proceed.](https://www.studysmarter.co.uk/explanations/chemistry/physical-chemistry/water-in-chemical-reactions/)
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