Q: A car skids along the road and smoke appears to be coming from under the tires. The heat that produces the smoke is caused by

OPTIONS:
- magnetism
- sound
- light
- friction
A: friction
Q: Radio signal interruption sometimes causes a humming or buzzing sound. These sounds are most likely caused by

OPTIONS:
- balanced forces.
- longitudinal waves.
- gravitational forces.
- electromagnetic waves.
A: electromagnetic waves.
Q: Which is needed for both boiling and melting to occur?

OPTIONS:
- solids
- gases
- heat
- pressure
A: heat
Q: In flowering plants, what structure containing DNA is transported from one plant to another?

OPTIONS:
- nectar
- chlorophyll
- glucose
- pollen
A:
pollen