Add Yahoo as a preferred source to see more of our stories on Google. After an ancient extinction killed about 85% of marine species, survivors in isolated refuges helped jawed vertebrates diversify ...
Scientists have long puzzled over the gap in the fossil record that would explain the evolution of invertebrates to vertebrates. Vertebrates, including fishes, amphibians, reptiles, birds, mammals, ...
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For each known vertebrate species, there are likely two unknown species
An in-depth analysis reveals that for each identified vertebrate species, there may be two others, nearly identical in appearance but genetically distinct. Scientists have long classified ...
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