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The streamlined shape of the penguin makes it an excellent underwater swimmer, enabling it to cut easily through the water to catch fish- it's primary food source.
the streamlined shape help to reduce air and water resistance like the shape of a plane and birds and fishes so as to reduce the over working and enable quick movement to it imposes less work not velocity
It is to help reduce water resistance and friction between the water and the seal,allowing it to swim faster to escape from its predator or to catch its prey.
No. Some animals( example. Puffer fish) don't depend on speed so they don't have streamlined body shape. Other fish that depends on speed to catch fish or running away from predator have streamlined body shape so that they can swim faster.
Streamlined .
Friction.
Sharks, Tuna, Mackerels, and Marlins are all examples of Streamlined body shape fishes.
the shape which is narrow in the beginning and broad in the middle is called a streamline shape. fishes have streamlined shape which makes their movement in water easier and helps to reduce water resistance.octopuses do not have a streamlined body but while moving it makes a streamlined body .boats ,fishes,airoeplanes etc have streamlineshape.
Many animals have streamlined body shapes and hollow bones, for the simple reason they strive to go faster, either in a water environment or in the air (Aerodynamics). Birds have hollow bones and usually have streamlined bodies if they are the product of natural evolution, unlike many game birds today. In the water, many of the more aquatic mammals, such as Otters, are streamlined to go faster underwater. They do not, however, have hollow bones, their weight supported by the water, as is the case with many of the mammals. Seals and such do not have hollow bones, although they have a layer of blubber and smooth skin, and a mainly streamlined body.
The body of ships and boats are streamlined coz that they can experince minimum amount of Friction while moving through water
wATER BEING STREAMLINED.
Fins of underwater animals are streamlined to make them glide through the water more easily, e.g. dolphins. Other animals include birds, whose beaks are at the front so they can too.