You are presented with the question "What can killing snakes cause?" and the following answer choices: - Snake population decrease. - DNA damage and mutations - Snake population variation. - death and devastation - dead organisms - Snake population increase. - Destroy crops - Snake population stabilization Now knowing that harming an animal species causes that animal 's population to decrease and killing snakes is more than unnecessary and harmful to the ecosystem, choose the best answer.
A:
Snake population decrease.