[Q]: About how many Earth days does it take the Moon to travel around Earth?
===
OPTIONS:
- 1
- 27
- 180
- 365
****
[A]: 27

[Q]: Within a substance, atoms that collide frequently and move independently of one another are most likely in a
===
OPTIONS:
- liquid.
- solid.
- gas.
- crystal.
****
[A]: gas.

[Q]: Infectious diseases are caused by
===
OPTIONS:
- allergies
- vitamin deficiencies
- chemical spills
- microorganisms
****
[A]:
microorganisms