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Anatomy of a Squirt


Sea squirts are tunicates, a type of sea life with a firm, rubbery outer covering called a "tunic," from which the name derives. As each organism feeds on algae and bacteria, they suck water in through one pipe and push it out a second. These bursts of water gave it the name "sea squirt." (Illustration by Jayne Doucette, Woods Hole Oceanographic Institution)

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