Humans and other mammals are vertebrates, animals with backbones. And all vertebrates belong to the scientific family called the chordata, animals with a rod-like structure that supports the body.
the chordates and the echinoderms - creatures such as starfish and sea urchins - diverged into separate evolutionary paths at least 500 million years ago.
But scientist believe that both groups descended from a common ancestor - making the starfish one of the oldest living relatives of humans.
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