Marine Biologist
If you mean, "are all under water creatures, sea creatures?" then no. The term SEA is for the ocean and there also can be creatures in freshwater. Also some creatures that live in water such as some snakes and sea turtles come out of the water every so often, so they are no total sea/water creatures. Fish are underwater creatures though.
No
if only I am a girl
It means that the veterinarian specializes in under water creatures health.
Marine biologist. Actually, a Marine Biologist is someone who studies marine organisms (plants, oceans, and animals), but someone who studies MAINLY marine mammals is a marine mammalogist.
Basically all that he does!
It can get in they're eyes, noses, lungs, they'll drink it.
Amphibians are both water AND land creatures
they usually stick their heads in the water and eat little shrimps or tiny creatures that live under the water that are smaller than the duck itself
Gills, as opposed to lungs, can filter out oxygen from water. And oxygen is something most creatures need to stay alive.
They live deep deep under alot of water, at rock bottom, were the water is not blue it is a dark black color.
Creatures that live only in water are referred to as aquatic.