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So it can keep it's direction
One example is that the dolphin has a stream-lined body.
its smooth
a bird's shape is stream lined + you have bad grammar in your question+ it shows how a birds body is suited to flying
It makes it easier for them to travel through the water.
The most streamline shape is the teardrop-shape or the better known as the aerofoil.That is the reason why the airplane body and wings is shaped like a teardrop.This shape reduces air pressure on the object thereby increasing air flow in return increasing the speed of the body.
having a stream lined body make you able to move swiftly and efficiantly through air or water because it lessens the area effected by air or water risistance
Birds have streamlined bodies and wings that enable them to move efficiently through the air, while fishes have hydrodynamic shapes and fins that reduce water resistance, allowing them to move easily through water. These adaptations help both birds and fishes to navigate their respective environments with speed and agility.
A fairing makes the bike more stream lined, reduces wind resistance.
A stream valley typically has a V-shape, while a glacial valley has a U-shape. This difference in shape is due to the different erosional processes involved. Stream valleys are eroded mainly by flowing water, while glacial valleys are shaped by the movement of glaciers that scrape and pluck rock and sediment.
Thier adaptations are thier stream lined shape,teeth,speed, and great smelling senses
Eel