Consider the following ecosystem and food chain: many animals live in or near kelp forests, including sea otters, whales, and seals.Animals that eat kelp, like sea urchins and snails, live in the forests too, and so do small fish that rely on the kelp as a place to hide from predators.Worms, crabs, and other fishes depend upon the kelp for habitat as well.Killer whales eat sea lions, unless the sea-lion population dwindles, in which case they eat sea otters.Sea lions eat salmon and other large fish.Sea otters eat sea urchins.Sea urchins eat algae such as kelp.What would happen to the populations of these organisms if a freak current brought in a large number of sea-urchin larvae ready to settle and metamorphose?

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.