yes ... its helps it to swim through water-resistance
yes
They Both don't have hair on their bodies even though a dolphins is a mammal, and a shark is fish.
To help them 'cut' through the water easily - just like other marine animals. Dolphins bodies are streamlined, to help prevent drag, whilst swimming at speed through the water.
Mammals: Thick layer of blubber to keep out chill, streamlined bodies (if they live in the sea eg. dolphins). Fish: Streamlined bodies, gills, fins and scales. Crustaceans (Hard shell (for protection) and pincers (for defence). Birds: Long strong beaks (to catch fish).
No, dolphins are mammals and mammals do not have scales. Reptiles are streamlined animals Yes. They are fast swimmers, and their torpedo shaped bodies allow them to manuever swiftly through the water.
Dolphins propelled and streamlined body can help them move smoothly in the ocean
Yes , example of streamlined .
Streamlined Bodies
The modern relative to an ichthyosaur would be a dolphin. Both ichthyosaurs and dolphins are marine mammals that have streamlined bodies adapted for swimming in the ocean and fins for propulsion. However, ichthyosaurs are extinct, while dolphins are still alive today.
They have streamlined bodies so that they can cut through the wind and air
dolphins's bodies are made to serve a porpoise
So they can swim faster (;
By evolution or by God, whichever you think is true.