- Jan 29, 2017
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I have a difficult time with macro-evolution because of what I hear about cells in our body. I don't understand how eyes evolved. Were all animals blind before full evolution? Did vision take millions of years? How did animals find food before the eye was fully developed?
Lots of living things today don't have eyes. They don't seem to have an issue finding food.
How long does it take for a fish to develop lungs that could use air? Did the first fish come out of the water and just die? Why would they have even developed lungs if they didn't need them to live in water?
Organs can be multi-functional. In the case of lungs, it appears they evolved from swim bladders.
There are multiple ways of absorbing oxygen. Some fish primarily use gills. Some fish use only the swim bladder. Some fish can do both.
You can read about this sort of thing with respect to Lungfish: Lungfish - Wikipedia
They give a clue how the early transition in the development of the ability to breath out of water could have looked like.
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