Take carp as an example. What are the characteristics of its body that adapt to its living environment?

Freshwater rivers, lakes and pits can be used, but there can be no pollution. Light pollution will not cause death, but it is not conducive to the growth of carp. There are no special requirements. The body is streamlined; The body surface is covered with scales; Breathe through the gills; Most sides of the body have lateral lines, which can sense the direction of water flow.