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B
Dinosaurs
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C
Elephants
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D
Dogs
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Solution
The correct option is A Fishes
Ichthyology is the branch of zoology devoted to the study of fish. This includes bony fish(Osteichthyes), cartilaginous fish(Chondrichthyes) and jawless fish(Agnatha). It is also known as fish science. Hence, ichthyology is the science of fishes.