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This is Scientific American's 60-Second Science. I'm Karen Hopkin. This'll just take a minute.
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What had the legs of a 'gator and the jaws of a fish?
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Why, the earliest land animals.
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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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The research is in the journal Integrative and Comparative Biology.
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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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But they lacked definitive proof.
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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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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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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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Why the lag?
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Could be the critters had to stop being such mouth breathers and shift from using gills to using lungs,
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which freed their jaws to develop in new ways.
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And which left no more excuses to not eat their veggies.
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Thanks for the minute, for Scientific American's 60-Second Science. I'm Karen Hopkin.
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显示原文 =This is Scientific American's 60-Second Science. I'm Karen Hopkin. This'll just take a minute.
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显示原文 =What had the legs of a 'gator and the jaws of a fish?
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显示原文 =Why, the earliest land animals.
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显示原文 =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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显示原文 =The research is in the journal Integrative and Comparative Biology.
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显示原文 =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 / 15
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显示原文 =But they lacked definitive proof.
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显示原文 =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 / 15
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显示原文 =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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显示原文 =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 / 15
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显示原文 =Why the lag?
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显示原文 =Could be the critters had to stop being such mouth breathers and shift from using gills to using lungs,
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13 / 15
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显示原文 =which freed their jaws to develop in new ways.
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14 / 15
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显示原文 =And which left no more excuses to not eat their veggies.
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15 / 15
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显示原文 =Thanks for the minute, for Scientific American's 60-Second Science. I'm Karen Hopkin.
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- 单句循环：关
- 单句循环：×3
- 单句循环：×5
- 单句循环：∞