近年来,生物学家发现蜜蜂、蝴蝶等为花朵授粉的昆虫越来越少了。蜜蜂都去哪儿了?研究人员发现了不少可能的原因。最近,美国研究人员发现,蜜蜂的消失可能与空气污染有极大的关系,是越来越污浊的空气把蜜蜂“熏走”了。嗅觉灵敏的蜜蜂蜜蜂是一种嗅觉十分灵敏的昆虫。虽然蜜蜂视觉也很发达,它们靠眼睛也能看到花朵,但是它们要找到远方的花朵,主要还得霏嗅觉。蜜蜂大脑呈椭圆形,一粒芝麻般大,是果蝇大脑体积的20倍。与其他昆虫相比,蜜蜂有更多与嗅觉相关的基因。它们能辨别几百种不同气味,能对植物气味分类,甚至可以嗅出几米外的花朵分 In recent years, biologists have found fewer and fewer insects that pollinate flowers such as bees and butterflies. Where did the bees go? Researchers found a number of possible causes. Recently, American researchers found that the disappearance of bees may have a great relationship with air pollution, and the more and more dirty air “smoked away” bees. Smell-sensitive honey bee is a very sensitive smell insects. Although bees are also well-developed in vision, they can also see flowers by their eyes, but they have to find flowers in the distance, mainly having a sense of smell. The bees have an oval brain, a large sesame seed that is 20 times larger than the fruit fly’s brain. Compared with other insects, bees have more genes related to the sense of smell. They distinguish hundreds of different scents, classify plant odors, and even sniff flowers a few meters away