Fact 1: Some precipitation that falls on land may soak into the ground, becoming groundwater. Fact 2: Wells are drilled into groundwater and springs are fed by groundwater. Given the two facts above, springs can be fed by what?
OPTIONS:
- mechanical waves
- vernal equinox
- precipitation
- rainfall
- digestive track
- water vapor
- aqueous solution
- carnivores

Answer: precipitation

Fact 1: Irradiating food can be used to kill existing microorganisms in the food. Fact 2: Food irradiation is one tool for improving food safety by killing pathogenic microorganisms. Given the two facts above, what does irradiating food do?
OPTIONS:
- Relieve pain
- enhance food's nutrients
- improves food safety
- allows growth of bacteria
- increases food waste
- chemical changes
- get chemical reactions started
- major threat to health

Answer: improves food safety

Fact 1: Antigens are molecules that the immune system recognizes as foreign to the body. Fact 2: Molecules are a group of atoms. Given the two facts above, what type of antigens does the immune system recognize as foreign to the body?
OPTIONS:
- animals
- epidermal
- Allergies
- negative
- dangerous
- graptolites
- group of atoms
- homogenous

Answer:
group of atoms