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algae - n. simple plants that have no leaves or stems and that grow in or near water
ozone - n. a form of oxygen that is found in a layer high in the earth's atmosphere
parasite - n. an animal or plant that lives in or on another animal or plant and gets food or protection from it
seaweed - n. a type of plant that grows in the sea
strand - v. to cause (something, such as a boat or a sea animal) to become stuck on land
