Evolution and That Shrimp on Your Plate
Explosions of new life forms followed by stasis are emphatically not what evolution expects to find, but it is what paleontologists do find.
Can Crabs Think? Can Lobsters Feel?
What about shrimp? Their brains turn out to have memory and learning centers, which has triggered an evolution squabble.
Design in the First Animals
Scientists debate whether ctenophores are the earliest animals to appear in the Cambrian explosion. If so, they arrived with multiple tissues, a nervous system, and a digestive system.