河水里,一大群河马张着大嘴巴议论纷纷。一只老河马说:“我听说,咱们和马没任何关系,连亲戚都攀不上。”“可不吗,说我们与牛是异族兄弟,那可能吗?”“我觉得可能,不能根据外形判断是不是亲戚,得看基因相似度。”旁听的河马嘴巴张得更大了。这时,一群斑马到河边来喝水。河马要吓唬吓唬斑马, River, a large group of hippopotamuses talking about the mouth. An old hippopotamus said: “I’ve heard that we have nothing to do with the horses and even the relatives can not climb.” “No, can we say that we are brothers with other breeds of cattle?” “I” Feel possible, can not be judged according to shape is not relatives, have to look at gene similarity. “” Listening hippo mouth more. At this time, a group of zebras came to the river to drink water. Hippopotamus scare to frighten zebra,