If you have been stung while swimming in the ocean, you probably came in contact with a cnidarians: jellyfish platyhelminthes: flat worms nemotoda: round worms mollusca: mollusks annelida: segmented worms

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when you breathe in, or inhale, your diaphragm contracts (tightens) and moves downward. this increases the space in your chest cavity, into which your lungs expand. the intercostal muscles between your ribs also enlarge the chest cavity. they contract to pull your rib cage both upward and outward when you inhale.