How big creatures assemble themselves

Speaking of animals, as I like to do of a Friday, how does Life get from little tiny single cell thingies to, you know, animals. Well, somewhat like this:

The little tiny cells don’t themselves get that much bigger. No. Instead they combine into cooperating flocks, like the fishes above.

To be clear, the above is not an actual creature evolving. What you see there is merely analogous to how bigger creatures assemble themselves from tiny little cells.

I continue to read this SS-W book. My problem is: I’m already persuaded of the truth of everything he says. But I am learning plenty, so will continue.

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