Why did animal life originate in the oceans rather than on the land?
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Water is easier. It took a while for creatures to evolve the ability to survive outside of water, those are more complex systems. And basically the answer we evolved was to take the ocean with us, inside.
People often think that evolution and biology is directed… “How does that O2 molecule know when to bind with the platelet?” It doesn’t. It’s pretty much random, they have to bump into each other, we’re just dealing with trillions of molecules at a time so the chance balances out. It’s the same between water creatures and land-based. Those lungs were a lot more complex than gills, so it took creatures longer to randomly mutate and get it right and viable. Thus, water critters happened first.
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