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1 .This is Scientific American's 60-Second Science. I'm Karen Hopkin. This'll just take a minute.
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2 .What had the legs of a 'gator and the jaws of a fish?
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3 .Why, the earliest land animals.
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4 .Because a new study shows that animals evolved weight-bearing limbs long before they had the chompers to really take advantage of a terrestrial diet.
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5 .The research is in the journal Integrative and Comparative Biology.
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6 .Scientists had suspected that the first four-legged creatures to haul their carcasses out of the ocean didn't belly up to the salad bar straight away.
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7 .But they lacked definitive proof.
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8 .Now, researchers have carefully examined the fossilized faces of 89 beasties that lived on land and sea some 300 to 400 million years ago.
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9 .They probed the jaws for a range of biomechanical features, such as how much force they could give to their bite.
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10 .The result: seems it took tens of millions of years after setting foot on land to come up with a mouth that could munch on the greenery.
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11 .Why the lag?
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12 .Could be the critters had to stop being such mouth breathers and shift from using gills to using lungs,
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13 .which freed their jaws to develop in new ways.
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14 .And which left no more excuses to not eat their veggies.
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15 .Thanks for the minute, for Scientific American's 60-Second Science. I'm Karen Hopkin.
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