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世界上的生物种类繁多,从最大的鯨到最小的微生物,大小不一。最大的动物是鯨。鯨是生活在海洋中的哺乳动物,包括的种类很多,主要有两种类型,一种是不长牙齿的須鯨,另一种是长牙齿的齿鯨,体形以須鯨最大。須鯨中有一种藍鯨,身体的长度达到33米,重量达到160吨,仅一顆心臟就重600—700公斤,一条舌头重达3吨,剛生下来的鲸“嬰儿”也有6—7米长,5—6吨重。海中的另两种哺乳动物,海象和海牛也是比较大的。在古代世界上曾生存过許
There are a wide variety of organisms in the world, ranging in size from the largest whale to the smallest microorganism. The largest animal is a whale. Whales are mammals living in the ocean. They include many types. There are mainly two types. One is a baleen with long teeth and the other is a long-toothed toothed whale with the largest baleen whale. The baleen has a blue whale with a body length of 33 meters and a weight of 160 tons. Only one heart weighs 600-700 kilograms, one tongue weighs 3 tons, and the newly born whale “baby” also has 6-7 meters. Long, 5-6 tons. The other two mammals in the sea, the walrus and the manatee are also large. Has survived in the ancient world