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  3. In the wild, the sense of smell fulfils animals basic needs, like the search for food. A hungry polar bear living in a barren an

In the wild, the sense of smell fulfils animals basic needs, like the search for food. A hungry polar bear living in a barren an

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问题     In the wild, the sense of smell fulfils animals basic needs, like the search for food. A hungry polar bear living in a barren and frozen landscape can smell the carcass of a seal over great distances, and it can also tell from the smell whether the carcass is going to be fit to eat or not.
   Animals that live on land receive scent messages through the air, but scents can be detected in water too. Sharks have a highly efficient sense of smell, and the hammerhead shark has evolved its strange shaped head in order to make it an even more efficient hunter. The hammerhead can detect blood at several hundred meters. It has nostrils at each end of its T-shaped head, and by moving its head from side to side it can home in on its prey, by following the stronger of the two scent signals.
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答案 在荒野，嗅觉能满足动物的基本需求，如觅食。一只生活在荒芜的冰冻地带的饥饿的北极熊能够嗅到远处的海豹尸体，而且它还能从气味上判断这尸体能否食用。 生活在陆地上的动物通过空气接受气味信息，但气味在水中同样能被察觉。鲨鱼具有高度灵敏的嗅觉，槌头双髻鲨的头部已进化成奇特的形状，这使它成为一名更高明的猎手。槌头双髻鲨可嗅到几百米外的血腥味。它在T形头部的两侧各有一个鼻孔，通过左右摆动，追踪两个气味信号中较强的一个，找到猎物．
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