What are the similarities and differences between the internal structures of shrimp and locusts?

(2) The living environment and internal structure of spiders, shrimps and locusts are quite different, but they all have a body composed of many segments, with exoskeleton on the surface and segmented feet and antennae. Some bodies are divided into head, chest and abdomen, such as locusts. Some are divided into head, chest and abdomen, such as spiders, and some are divided into head and trunk, such as centipedes.

(3) The rabbit heart is divided into four chambers, namely left atrium, right atrium, left ventricle and right ventricle. Blood circulation, including systemic circulation and pulmonary circulation, has strong oxygen transport ability, which is beneficial to the decomposition of organic matter in the body and generates a lot of heat to keep the body temperature constant. Systemic circulation: left ventricle → systemic artery → body part → systemic vein → right atrium; Pulmonary circulation: right ventricle → pulmonary artery → lung → pulmonary vein → left atrium, which shows that rabbits are related to humans.

So the answer is: (1) Fish can breathe by alternately opening and closing the mouth and the back edge of gill cover.

(2) Body parts

exoskeleton

break up

(3) 4

systemic circulation

pulmonary circulation

constant

Rabbits are related to humans.