Sea stars are keystone predators in rocky intertidal communities. In which of the following ways does predation by sea stars influence a rocky intertidal community? It increases species diversity. It decreases the amount of primary producers in the community. It increases the size of mussel populations. It decreases species diversity. It increases the body size of the average sea star. Before diving, many marine mammals take several deep breaths and then exhale. What is this type of breathing? Counterflow exhalation Echolocation Diving preparation Apneustic breathing Structural breathing Which of the following is a biotic factor in an ecosystem? Eutrophication Dissolved organic carbon The density of crown of thorn starfish Nitrogen availability Salinity What does a right whale typically feed on? Small fishes Small plankton Smaller whales Large plankton Bottom-dwelling crustaceans A marine biologist is interested in collecting samples of encrusting algae. Where is he most likely to find specimens? The upper intertidal The muddy bottom The middle intertidal The sandy beach The lower intertidal Which of the following invertebrates does not use specialized gonad tissues to produce its reproductive cells? Sharks Jellyfish Sponges Sea stars Tubeworms In sharks, what is the covering that moves across the eye? The nictitating membrane The cell membrane The eye covering The operculum The eyelid Which sense does echolocation rely on? Sound Electromagnetic waves Vibrations Vision Smell Which organism could be asexually propagated by separating its cells from one another using a fine sieve and then placing those cells into a petri dish of seawater? A jellyfish A crab An anemone A sponge An octopus

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