Sleeping giant could end deep ocean life

A previously overlooked factor—the position of continents—helps fill Earth's oceans with life-supporting oxygen. Continental movement could ultimately have the opposite effect, killing most deep ocean creatures.

Bag-like sea creature was humans' oldest known ancestor

Researchers have identified traces of what they believe is the earliest known prehistoric ancestor of humans—a microscopic, bag-like sea creature, which lived about 540 million years ago.

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