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Scientists Have Found the First Branch on the Tree of Life

In chapter two, we trace the beginnings of the Animal Kingdom in a Tree of Life. Almost all animals on earth derive from a single branch of that tree--except a few, including comb jelly and sponges. Now researchers have concluded that comb jelly was split off from the main branch of the Animal Kingdom first--700-800 million years ago. Here's the story: , and here's the research:

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