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Answer:
Homologous structures are structures that are similar in related organisms because they were inherited from a common ancestor. These structures may or may not have the same function in the descendants. Figure below shows the hands of several different mammals. They all have the same basic pattern of bones
The heart has four chambers and four valves that regulate blood flow.
Anatomy:
Left and right atria
Left and right ventries
Mitral valve
Tricuspid valve
Aortic valve
Pulmonary valve
