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According to a study conducted by scientists at IUPUI and colleagues in the United Kingdom, the emergence of tree roots may have set off a sequence of major extinctions that shook the Earth's waters around 300 million years ago.
Five hundred million years ago, soft-bodied sea animals used phosphate to build elaborate, protective armor. Then their resource dried up, and evolution moved on.
Deep in the oceans dwell creatures that can evade many of the evolutionary drivers of life on land – and they remain seemingly unchanged through time.
Shutterstock We see evolution all around us, constantly, in every living thing. Yet in the deep oceans we find a number of “living fossils” reminiscent of creatures from prehistoric times.
New fossils are revealing the earliest jawed vertebrates — a group that encompasses 99 percent of all living vertebrates on Earth, including humans.