question: Acid changes the color of what when acidity reaches certain amounts?
choices.text: black marks moles carbon green roots paper Mosses.
choices.label: A B C D E F G H
formatted_question: Acid changes the color of what when acidity reaches certain amounts? (A) black (B) marks (C) moles (D) carbon (E) green (F) roots (G) paper (H) Mosses.