The Scyphozoans are commonly found in Florida and hang upside down in the water with their tentacles pointed towards the surface. They do this in order to provide light to the photosynthetic dinoflagellates housed in their bodies. What are they

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that is wrong, its not thymus.

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.

i believe it's c. the trait for large beaks will be passed on to future generations through natural selection.

since eventually smaller beaks would have to find another source of food or even eventually just die out from the lack of food.