单词：diploid chromosome numbers in some animals
单词：diploid chromosome numbers in some animals 相关文章
[00:00.86]Another endangered species, [00:02.83]the Yangtze Dolphin,is China's only fresh-water [00:06.53]dolphin and is sometimes called' the panda [00:09.35]of the Yangtze River'because it is so rare. [00:13.11]its numbers are decreasing for severa
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During the last ice age, rapid swings in temperature occurred within decades or less, meaning populations of organisms had to adjust quickly to new environments or face extinction. 在最后一个冰河世纪中，温度在数十年甚至更短的时间
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Scientists at the Whitehead Institute in Cambridge, Massachusetts say it's fortunate for humans that the Y chromosome is not on the verge of extinction. That's because the Y is the chromosome that makes males males. The outlook is less favorable for
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This is the VOA Special English Health Report. A miscarriage is the natural loss of a pregnancy before the twentieth week. This happens to as many as twenty percent of known pregnancies. Experts say many pregnancies end before a woman even knows she
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A Just stop and think how important numbers are to our lives. Numbers control us. In fact, we are numbers. We have passport numbers, social security numbers, ID numbers, and more. We live in a house and a street that has a number. We communicate with
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