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All fish have an immune system to fight diseases, although the system is by no means as advanced as the ones found in mammals. The system breaks down into two main parts: protection...
“Metabolism” is the word used to cover the system of chemical processes that keep something alive. For a fish, that means providing energy to power critical body processes or building...
A fish’s cardiovascular system comprises of two main parts: the heart and the system of pipes (veins, arteries and capillaries) that carry blood throughout the body. Every organ and...