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Which animal has a single-loop circulation?

A. human
B. fish
C. housefly
D. earthworm
E. octopus


Sagot :

Final answer:

Fish have a single-loop circulation system where blood flows unidirectionally from the heart through the gills to the body.


Explanation:

Fish have a single-loop circulation system. In this system, blood flows unidirectionally from the two-chambered heart through the gills and then to the rest of the body. This type of circulation is characteristic of simpler vertebrates.


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