List out eight characteristics that help distinguish a fish from the other vertebrates.

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Detailed Solution

A fish can be distinguished from other vertebrates by possessing the following characteristic features.

Fishes are completely aquatic animals.
Locomotion is assisted by paired and unpaired fins.
Presence of two chambers, branchial or venous heart.
Single circulation occurs in which the blood passes only once through heart in each complete circuit.
Presence of meninx primitiva, the only meninx enveloping the central nervous system.
Presence of well-developed lateral- line sensory system.
Eyes are without eyelids and each eyeball is protected by a nictitating membrane.