What? your question makes no sense. Byt usually marine animals have fins or flappers to glide them through water.
marine mammals move by swimming
Marine mammals live and water and they need to surface to breathe. While land mammals can breathe just as humans do.
under water
Sounds like you are talking about octopus and squids which are not mammals.
Fish and some marine mammals live in water all their lives.
they use it by listening
No mammals can breathe underwater. All mammals, including sea mammals, must breathe above the surface of the water. This is why marine mammals such as dolphins and whales frequently come to the surface.
No marine life live on Antarctica: marine life lives in open water. However, marine birds and marine mammals do visit Antarctica's beaches to breed.
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.
it's called a marine bioligist.
Types of life in water include fish, plants, marine mammals, invertebrates, and amphibians.
Many marine mammals, amphibians, and fishes defecate in that water on a regular basis.
Marine mammals such as whales and dolphins have blubber, which is a layer of fat. Blubber not only helps them to keep warm, but also provides energy.