marine biology
Charles Marshall admires the skull of a Phonerpeton, one of the first creatures to evolve teeth, which allowed animals to catch prey on land. The skull is about 275 million years old. |
When fish first started bitingBefore fish began to invade land, about 365 million years ago, they had some big problems to solve. They needed to come up with new ways to move, breathe, and eat. Take the latter, for example. Fish usually pucker up and suck prey into their mouths. But air is 900 times less dense than water, so land-livers must bite into their food to get a meal. Researchers at Harvard University have just completed a study that gives a clear picture of how that change was made. |
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