29. Answer in detail IV

 

a. A streamlined body gives an aquatic animal's body a smooth surface, decreasing water resistance by minimising friction and facilitating movement.

 

b. Fish have a streamlined shape that makes it difficult to move fast through the water.

 

c. In fish, muscles, fins, and the tail are crucial to maintaining balance.

 

d. The streamlined body of a fish is intended to increase friction while moving through water. They are also provided with strong muscles, which help them swim.

 

e. When a fish begins to swim, the front part of its body curves in one direction while the tail remains on the opposite side.

 

f. Fins and tails are the locomotive organs in fishes as their movement helps the fishes to move, change directions underwater and maintain balance.