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That’s because your example, a bat, is a high level of abstraction. If you dig into the cellular level things start becoming very single-purpose, even more so down to the atomic level, and so on. The architecture of recursive composition usually done in building large software was found in nature first.

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On the contrary, once you start digging down into details, you'll see living things made of multi-purpose components with fuzzy boundaries, going very much against "single responsibility principle" and the like. That's because evolution isn't like human engineers, who need to walk up and down the abstraction ladder so things they care about fit in their head. Evolution is brute-forcing the problem space, using a greedy optimization algorithm. It doesn't need to remember anything.

Bats are single celled?

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