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adapted algae anemones animals attached autotrophs bacteria barnacles beach benthic benthos biological birds blood body bony fishes bottom burrow cells changes chemical clams Coast consumers continental shelf copepods coral reefs crabs cycle deep-sea depth detritus diatoms digestive dinoflagellates dissolved diving drifting dune ecosystem eggs enable energy estuary evolved feed Figure fins food chain freshwater gill habitats hydrogen increase intertidal zone larvae layer marine environment marine mammals marine organisms materials migrate mollusks move mussels nekton nitrogen nutrients ocean organic molecules organisms living oxygen particles pelagic Photo photosynthesis phytoplankton pigments plankton plants plates polyps populations predators prey produced reproduction rock rocky shore salinity salt marsh sand sea anemones sea cucumbers sea grasses sea urchins seafloor seastars seawater seaweeds sediments sharks shell snails species sperm sponges structure substrate subtidal surface survive swim bladder temperature tentacles tidal tide pool tissues tropical tube turtles underwater waves whales worms zooplankton