Yep, that's right: even algae can grow a shell if the right chance mutations happen. In seawater, there's a certain amount of dissolved calcium. Algal coral luckily evolved a mechanism for fixing calcium to carbon and oxygen to express calcium carbonate.
On any patch of exposed rock in shallow water, there's likely to be thin layer of crusty, reddish, stuff. That's an algae, hiding inside a shell.
It doesn't make huge reefs, like polyp coral, but given enough time, it probably would. Two utterly different species, kingdoms apart, have evolved exactly the same mechanism to solve the same problem.
That's as far as you can evolve here!
You can go back to the start with the link above, or share what you became with the icons below.
Evolution starts with the Last Universal Ancestor.
You can find out what happened before evolution here.
You can also short-cut to Land plants, or Animals
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