Living interacting with living component: sea urchins and oysters compete for red algae, A sea slug consumes algae, A sculpin hides in the seaweed., Sponges eat bacteria., Limpets consume seaweed., A herring gull eats a sea star., Living interacting with non-living component: A hermit crab lives inside a shell, Sculpins, a type of fish, take in oxygen through their gills., Water brings a sea star to the shore, Barnacles stick to rocks, Seaweed takes in sunlight in order to make energy, Bacteria return nutrients to the environment.,

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