Q: Fact 1: Bacteria in soil convert atmospheric nitrogen into a form usable by plants. Fact 2: More bacteria mean healthier soil. Given the two facts above, what allows soil to convert atmospheric nitrogen into a usable form by plants?

OPTIONS:
- hydrogen and oxygen
- diseased soil
- peachleaf willow
- bacteria-free soil
- healthier soil
- nutrients
- virus filled soil
- Cooking

A: healthier soil

Q: Fact 1: Sound can be used for communication by animals. Fact 2: Goats are four legged animals. Given the two facts above, what can use sound for communication?

OPTIONS:
- squids
- humans
- h2o
- clouds
- goats
- bears
- Bats
- plants

A: goats

Q: Fact 1: Feathers help birds fly and provide insulation. Fact 2: Penguins keep warm with layers of insulation. Given the two facts above, feathers help birds fly and what?

OPTIONS:
- staying warm
- keep warm
- Absorb light
- allow growth
- keep birds
- protect them
- keep cool
- keep grounded

A: keep warm

Q: Fact 1: Smoking tobacco decreases stamina. Fact 2: Breathing someone else's tobacco smoke can be seriously harmful to one's health. Given the two facts above, secondhand smoke decreases what?

OPTIONS:
- nutrients
- motility
- stamina
- Energy.
- energy
- Glucose
- voltage
- apoptosis

A:
stamina