Marine sediment is useful in studying past climates because the coral and similar things give clues to scientists.
How is caenorhabditis elegans useful in studying genetics?
Marine biology is a vast discipline incorporating every aspect of biology but with a marine emphasis, this ranges from ecology (which is heavily statistical) to physiology. So in answer to your question, yes it is used, the need however depends on what path you take. Vector calculus has proved to be useful while studying marine biology.
microscope or telescope
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because they are :)
A hammer is useful when putting up a shelf. Studying is useful if you want to get a good grade on a test.
A useful echo is echolocation, which is used by marine animals such as dolphins to locate and then hunt their prey
A quadrat is a small plot that is used in ecology that isolates an area for study. It is useful for studying insects by helping to measure the percentage cover for insect species.
Llama or goat
Defrost the windshields so you can see where you are going. Useful in icy climates.
Satellites and ground stations.
rare or unusual events