question: what are used for observing materials up close?
choices.text: x-rays crucial demagnification beakers camera strap backbones lenses light
choices.label: A B C D E F G H
formatted_question: what are used for observing materials up close? (A) x-rays (B) crucial (C) demagnification (D) beakers (E) camera strap (F) backbones (G) lenses (H) light