The Underwater World

adult algae anemone animals and plants aquatic Atlantic barnacles basking shark bivalve bivalve molluscs blue whale body bottom bottom-living animals breeding buoyancy carnivorous cells Chapter coast copepods coral reefs crabs crustaceans currents deep water deep-sea deposit feeders deposits depths diatoms dinoflagellates eggs epifaunal epilimnion European eel fauna feed female fins fish float fresh waters freshwater gills hatch insects instance invertebrates known lake land large number larvae layers living mammals marine animals method metres microscopic molluscs mouth mussels number of different nutrients Ocean oxygen particles particularly photophores plankton planktonic animals planktonic plants plant plankton polyps prawns prey produce pteropods relatively rock rocky shore salinity salts sand sea bed sea floor sea water sea-anemones sea-urchins seaweeds shallow sharks shells siphonophores skeleton sperm whale sponges squids starfishes sting-cells surrounding water suspension feeders swim swimbladder temperature tentacles tide tiny tissue toothed whales tropical tube turtles worms zooxanthellae