[Q]: Infections may be caused by
===
OPTIONS:
- mutations
- microorganisms
- toxic substances
- climate changes
****
[A]: microorganisms

[Q]: Frame construction predominates in the New England area due to the abundance of
===
OPTIONS:
- clay.
- masonry.
- wood.
- steel.
****
[A]: wood.

[Q]: Earth's core is primarily composed of which of the following materials?
===
OPTIONS:
- basalt
- iron
- magma
- quartz
****
[A]:
iron