This worm-like creature is the first ancestor on the human and animal family tree

Evidence of a worm-like creature about the size of a grain of rice has been uncovered in South Australia, and researchers believe it is the oldest ancestor on the family tree that includes humans and most animals.

The creature lived 555 million years ago.
It's considered to be the earliest bilaterian. Bilaterians are organisms with a front, back, two openings on either end and a gut that connects them. They were an evolutionary step forward for early life on Earth.

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