it works like our circulatory system
Your an idjit
The circulatory system, like the water system, continually reuses the same materials.
Poriferans do not have distinct circulatory system. Instead water flow system support all these functions like circulatory, respiratory, excretory etc.
closed circulatory system (double circulatory system)
The nutrients in our circulatory system is like the passengers in the train, the blood is just like the train and the blood vessels like the rails of the train.
In an open circulatory system, the blood does not flow in closed vessels and surrounds the organs directly within the body cavity. This type of circulatory system is found in invertebrates like insects and mollusks.
They're both the circulatory system.
Amphibians have closed circulatory system Closed
hyghgyykh ij
Some species, like insects, have an open circulatory system
The circulatory system
open circulatory systemclosed circulatory system.