Answer the following question: Fact 1: Harming an animal species causes that animal 's population to decrease. Fact 2: Serious questions remain regarding what happens if endangered populations continue to decrease. Given the two facts above, harming an animal species causes that animal's species to become what?

Select from:
(1). deforestation
(2). an animal species
(3). threatened
(4). barrel-shaped
(5). more populous
(6). endangered
(7). more popular
(8). imbalanced
Answer:
(6).