Cystic fibrosis is an inherited genetic disorder caused by two copies of a defective recessive gene that causes a) senility at around age fifty and slow nervous system damage. b) the buildup of fluid in the lungs, and complications from pneumonia. c) a form of mental impairment, along with heart defects, and a webbed neck. d) the inability of the blood to clot properly, resulting in organ damage and easy bruising.

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.

the answer is: reproductively

i think i spelled it wrong lol

anyways hope i

-lavira: )