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Complete the following summary with words you have heard:
Technology is not the only thing that pushes athletes : the gene pool with competitive sports has changed.
In the 20th century, it was thought that the , whatever sport. And this showed in athletes' bodies. In the 1920s, elite high-jumpers and elite shot-putters were the same
But that idea started to fade away, as sports scientists realized that highly into certain athletic niches were a better idea. A form of artificial selection took place, and athletes' bodies became more different one another.
Today, the elite shot-putter is pounds
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