Penelope Greenslade does not work for, consult, own shares in or receive funding from any company or organization that would benefit from this article, and has disclosed no relevant affiliations ...
More than 400 million years ago, an insect-like animal called the springtail developed a small protein that prevents its cells from freezing. The globe was hot and humid. The sea was teeming with life ...
The globe was hot and humid. The sea was teeming with life. Early squids, eel-like fish and sea worms hunted smaller animals. Above ground, however, nothing stirred. The animals had not yet crawled ...
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