所有的生命形式,都会发展适应其所栖息的地方、所吃的食物或其如何行动的特点。这往往导致物种之间即使不相关但看似相似。以下面五种动物为例:相似之处一只灵活的鼻子帮它们挖出昆虫。它们有一个能诱捕蚂蚁和白蚁的长长的黏舌头。食蚁兽可以一分钟内将舌头吞吐150次。它们产生大量的唾液保持舌头的黏性。都有强壮的爪子用来挖掘蚂蚁丘。土豚和犰狳有少数槽牙,其余的都没有。 All life forms develop characteristics that adapt to where they inhabit, eat, or act. This often results in similar but not related species. Take the following five animals as an example: Similarities A flexible nose helps them dig out insects. They have a long sticky tongue that can trap ants and termites. Anteaters can swallow their tongue 150 times in a minute. They produce large amounts of saliva to keep the tongue sticky. There are strong paws to dig ant mounds. Aardvark and armadillo have a few teeth, the rest are not.