question: what are used for separating mixtures?
choices.text: calcium carbonate cloth-edged screens physical properties precipitation rocks dirt A hinged joint isolating and copying genes
choices.label: A B C D E F G H
formatted_question: what are used for separating mixtures? (A) calcium carbonate (B) cloth-edged screens (C) physical properties (D) precipitation (E) rocks (F) dirt (G) A hinged joint (H) isolating and copying genes