16. Answer briefly IV

List five characteristic features of fishes.

 

a. Fishes are  or cold-blooded animal whose internal temperature varies with the ambient  temperature.

 

b. They are aquatic vertebrates with . Fishes have a  body, which is divisible into a head, trunk, and tail.

 

c. The locomotion of fishes is through  and  fins. Their body is covered with .

 

d. Fishes respire through . The heart of the fish is  chambered.

 

e. There are two types of fishes.  fishes skeleton is made of cartilages. Example includes  and skates.  fishes skeleton is made of bones. Example includes  and mullets.