question: What leads to population growth?
choices.text: antigens infertility pigmentation isolation antibodies miscarriage several genes Pregnancy
choices.label: A B C D E F G H
fact2: Births are the main component of population growth.
combinedfact: Pregnancy leads to population growth
formatted_question: What leads to population growth? (A) antigens (B) infertility (C) pigmentation (D) isolation (E) antibodies (F) miscarriage (G) several genes (H) Pregnancy