Problem:OPTIONS:
- eating
- driving
- survival
- rain
- movement
- farming
- vehicles
- cooking

Fact 1: Fog is formed by water vapor condensing in the air. Fact 2: Fog When driving, fog is an obstacle or a hindrance that makes things obscure. Given the two facts above, what can be water vapor condensing in air be a hindrance to?
****
A: driving

Problem:OPTIONS:
- myopia
- most organisms
- balding
- basic building blocks of life
- age spots
- harmful substances
- Illness from microrganisms
- single-celled organisms

Fact 1: Microorganisms can cause infections. Fact 2: For example, an infection of a limb is usually treated with antibiotics. Given the two facts above, antibiotics can be used to treat what?
****
A: Illness from microrganisms

Problem:OPTIONS:
- root growth
- heat or cold
- pollen
- electrically
- sexually
- seeds
- survive
- a cuticle

Fact 1: Roundworms reproduce sexually. Fact 2: Nematodes are millimeter-sized roundworms. Given the two facts above, nematodes reproduce how?
****
A: sexually

Problem:OPTIONS:
- muscle contractions
- circulation
- exhalation
- Temperature changing
- Movement of an air mass
- flow of electrons
- vibrations
- with their fur

Fact 1: Mammals can also generate little bursts of heat by shivering. Fact 2: Shivering causes muscle contractions to warm the body. Given the two facts above, mammals can also generate little bursts of heat by?
****
A:
muscle contractions