The dawn of animal evolution saw a bizarre array of sea creatures
Newfound fossils turned up a strange zoo of often-complex creatures, including some suggesting that evolution of left-right symmetry occurred earlier than once though.
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Scientists Say: Snow line
On Earth, this line marks the edge of snow-covered ground. In space, it marks a spot where a certain molecule might freeze.
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Oceans
Explainer: What are corals?
Though they can look like rocks or plants, corals are animals. Most are made up of colonies of individuals called polyps.
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Earth
Analyze This: A rocket reentry spiked metal levels in the atmosphere
Detection of lithium from a SpaceX rocket reentering the atmosphere offers new evidence that space debris could harm the ozone layer.
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This tool-using cow stunned scientists with her smarts
Veronika the cow scratches hard-to-reach body parts using a brush. This feat is forcing scientists to rethink which animals can use tools.
