input with options: Q: What do you call structures like a whale's pelvic bones, which were once attached to legs, or wings that cannot be used for flight? A:
OPTIONS:
- primitive
- primordial
- distinctive
- vestigial
output: vestigial

input with options: Q: What subphylum, which includes crabs and crayfish, represents the dominant aquatic arthropods? A:
OPTIONS:
- arachnids
- sponges
- invertebrates
- crustaceans
output: crustaceans

input with options: Q: The concentration of a substance is the quantity of solute present in a given quantity of ___________? A:
OPTIONS:
- structure
- mixture
- salutation
- solution
output: solution

input with options: Q: Depending on the surrounding conditions, normal matter usually exists as one of three phases: solid, liquid, or this? A:
OPTIONS:
- fluid
- crystal
- ice
- gas
output:
gas