卵巢的生卵作用一般分为三个阶段，即______ 期、______ 期和______ 期。填空2、填空3、 - 查题网

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成人高等教育 / 生理学

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卵巢的生卵作用一般分为三个阶段，即______ 期、______ 期和______ 期。
填空2、
填空3、

积分

生理学

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25、Can trees talk? Yes, but not in words. Scientists have reason to believe that trees do communicate with each other. Not long ago, researchers learned some surprising things. First a willow tree attacked in the woods by caterpillars (毛虫) changed the chemistry of its leaves and made them taste so terrible that they got tired of the leaves and stopped eating them. Then even more astonishing, the tree sent out a special smell--a signal causing its neighbors to change the chemistry of their own leaves and make them less tasty. Communication, of course, doesn't need to be in words. We can talk to each other by smiling, raising our shoulders and moving our hands. We know that birds and animals use a whole vocabulary of songs, sounds, and movements. Bees dance their signals, flying in certain patterns that tell other bees where to find nectar (花蜜) for honey. So why shouldn't trees have ways of sending message?统考英语阅读理解