Q: Fact 1: Hibernation is used for conserving energy by some animals. Fact 2: When they hibernate, bears enter a deep sleep. Given the two facts above, why do bears enter a deep sleep?

OPTIONS:
- Thyroid-stimulating hormone
- prolactin release
- chemical messengers
- They can't live in the cold
- To get some rest
- To conserve energy
- Endocrine system
- They don't like the winter

A: To conserve energy

Q: Fact 1: Viruses cause many human diseases. Fact 2: Human diseases can be detected clinically. Given the two facts above, what can be detected clinically?

OPTIONS:
- clinics
- viruses
- murmur
- ghosts
- anemia
- vampires
- harm
- sweating

A: viruses

Q: Fact 1: Smoking tobacco decreases stamina. Fact 2: Athletes use it to promote stamina and endurance. Given the two facts above, doing what with tobacco decreases athletic ability?

OPTIONS:
- steroids
- wearing
- A virus
- eating
- Heart rate
- smoking
- humans
- decorating

A: smoking

Q: Fact 1: Creating paper requires cutting down trees. Fact 2: Trees clean and cool the air. Given the two facts above, what does creating paper do?

OPTIONS:
- duplicate itself
- Makes the air dirtier
- Makes food
- Cleans the air
- converting electricity to heat
- to move people
- Plant growth is reduced
- Lengthens tree life

A:
Makes the air dirtier