When the intercostal and diaphragm muscles relax, the ribs: Select one:

a. move no where.

b. move outward.

c. lift.

d. drop.

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The answer for this question is D

humans can cause extinction of a species through overharvesting, pollution, habitat destruction, introduction of invasive species (such as new predators and food competitors), overhunting, and other influences. explosive, unsustainable human population growth is an essential cause of the extinction crisis.

explanation:

i didn't have the answer choices , but i tried my best.