List two organisms that can eat purple shiny sea urchins

a adaptation is when organism changes itself to fit the environment

ex. when its cold outside i wear a jacket

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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.