Which of the following arthropods are ecologically important, because they are the basis for many marine food webs, including those involving baleen whales and commercially important fish?

MCQs on the field of Marine Biology, from a survey of the origin of oceans and their movements to details of marine food webs, life cycles, and marine zonation. As well as on marine environment and ecology, taxonomy and physiology, and contemporary concerns in the field, including human influences on marine systems.