Q: Telescopes use which kind of lenses to enlarge images? A:
OPTIONS:
- crystalline
- spherical
- concave
- convex

Answer: convex

Q: What is the simplest unit that has the fundamental chemical properties of an element? A:
OPTIONS:
- neutron
- nucleus
- cell
- atom

Answer: atom

Q: What occurs in a population when its allele frequencies change over time? A:
OPTIONS:
- variation
- generation
- extinction
- evolution

Answer:
evolution