The shapeless sea sponge, one of Earth's more bizarre creatures, is likely the first and most ancient animal.
Have we found the first sign of animal life on Earth?
Paleontology News
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Sea sponge could be the first animal on Earth
Sponges can survive low oxygen and warming waters. They could be
Do these fossilized structures belong to Earth's first animals
SpongeBob, the Carnivore - The New York Times
Sea Sponges Were The First Animals On Earth, Find Scientists
Earth's first animals may have been sea sponges, Science
What is a sponge?