question: Collar cells have tiny hairs that trap very tiny pieces of what?
choices.text: matter keratin pigment allergen RNA protozoa Chemicals fish
choices.label: A B C D E F G H
fact2: Particles A particle is simply a very tiny piece of matter.
combinedfact: Collar cells have tiny hairs that trap very tiny pieces of matter
formatted_question: Collar cells have tiny hairs that trap very tiny pieces of what? (A) matter (B) keratin (C) pigment (D) allergen (E) RNA (F) protozoa (G) Chemicals (H) fish