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a siphon
a dolphin gets around by using its tail and flippers to propel itself through the water.
The opposite direction of the water it moved.
It sucks in water and then pushes it out to propel itself.
With the tail. useing his tail moving it back and forth he also sways his body a little
It spins to move through the water
This a very simple answer. They use their tentacles to push themselves through the water. No this is actually wrong. The squid uses its siphon to propel itself through the water. How it does this is it fills its mantle with water then the squid pushes it out through the Siphon.
A fish uses its fins to push water backwards and propel itself forwards.
penguins have wings so they can propel themselves through the water
expel
That is why they have webbed feet So a larger area to propel through water
A bargepole is a variety of quant pole used to propel a barge through the water.