In this task, you are given a multiple-choice question and you have to pick the correct option. Answer with option indexes (i.e., "A", "B", "C", and "D").

Which would likely decrease the food in an environment? (A) gravity (B) water evaporation (C) a tree (D) time
B

harming an animal species causes that animal 's population to do what? (A) explode (B) rise (C) plummet (D) burst
C

An organism passes from the world and so it (A) has croaked (B) has money (C) has health (D) has flown
A