At the zoo, a group of chimpanzees has found a way to groom each other with branches from a fake tree in their cage. the younger chimpanzees invented this grooming technique and are passing it on to their peers and offspring. thus, they are:

b.

hoped i

explanation:

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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.

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.