So they present less resistance when swimming through water and therefore use less energy and swim faster.
Streamlined bodies reduce drag as they move through a fluid, allowing for faster movement with less resistance. This is particularly advantageous in swimming, cycling, and other sports where speed is a key factor. Streamlined bodies also help to improve efficiency and reduce energy expenditure.
dolphins's bodies are made to serve a porpoise
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Stream-lined bodies in aquatic animals aid in swimming. It produces swifter, more graceful movement in water.
its smooth
Risso's dolphins have scars on their bodies from interactions with other dolphins, predators, or from feeding on prey with sharp teeth or spines.
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So it can keep it's direction
It makes it easier for them to travel through the water.
One example is that the dolphin has a stream-lined body.
it is lined with dead bodies
A fairing makes the bike more stream lined, reduces wind resistance.