input with options: Q: An atom can be classified as a particular element based solely on its what? A:
OPTIONS:
- light number
- spectrum
- ability
- atomic number
output: atomic number

input with options: Q: Antibodies also mark pathogens for destruction by which cells? A:
OPTIONS:
- interferons
- leukocytes
- platelets
- phagocytic
output: phagocytic

input with options: Q: What produces almost one-half of the earth's oxygen through photosynthesis? A:
OPTIONS:
- prokaryotes
- algae
- arthropods
- protists
output: protists

input with options: Q: What is the general name for a solid material that is formed via a natural process? A:
OPTIONS:
- chemical
- gas
- plasma
- mineral
output:
mineral