Animals are assumed to have evolved from a group of single-celled creatures known as choanoflagellates some 800 million years ago.
Choanoflagellates are filter feeders with a hairy collar around their mouths. This collar aids them in catching food particles in the water.
The first animals were most likely simple organisms like sponges.
Sponges are filter feeders with no nerves or muscles. They are attached to the seafloor and feed by filtering water through their bodies.
A 2023 study discovered that comb jellies, which are sometimes mistaken for jellyfish, maybe closely linked living organisms to the first animals.
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