science in a can
Trilobites Not very many organisms—especially animals—witnessed as much of the Earth’s history as trilobites. Though they went extinct roughly 250 million years ago, the marine arthropods toughed it out through 300 million years of earthquakes, volcanic eruptions, and ice ages. They struggled through the shifting of continents and the forming and eroding of countless mountain ranges. The primary reason for their hardiness was their adaptability. There are over 17,000 known species th
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