Why did animal life originate in the oceans rather than on the land?
In: 173
So many reasons.
1. Water does not change temperature very quickly. Before life colonized the surface there would have been much stronger temperature shifts (somewhat like what we see in deserts today), making it much less hospitable to life.
2. Before oxygen (free oxygen is only produced by life) there would have been no ozone, meaning a lot more radiation.
3. Life as we know it is all about water. Inside the cells is water, and living in water means that you can take in and eject stuff easily. None of that water preservation or complex nutrient uptake systems.
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