Q: Q: What type of temperatures increase the likelihood of fires? A:

OPTIONS:
- freezing
- reduced
- lower
- higher

A: higher

Q: Q: What is the common word for potential difference in a circuit? A:

OPTIONS:
- watt
- velocity
- frequency
- voltage

A: voltage

Q: Q: What do cells produce as they age? A:

OPTIONS:
- carcinogens
- wrinkles
- oxidants
- proto-oncogenes

A: proto-oncogenes

Q: Q: While in the lungs, blood gives up carbon dioxide and picks up what element before returning to the heart? A:

OPTIONS:
- nitrogen
- methane
- hydrogen
- oxygen

A:
oxygen