Problem: OPTIONS:
- infections
- blood cells
- fungi
- insects
- viruses
- honeybees
- plasma
- barnacles
Q: Fact 1: Some viruses live in a dormant state inside the body.  Fact 2: When ferns are dormant it is as if they are hibernating.  Given the two facts above, what can stay hidden in a hibernating state inside the body?
Answer: viruses

Problem:OPTIONS:
- harmful substances
- Organic compounds
- bacon
- cayenne
- acetic acid
- dogs
- Chlorophyll
- Calcium carbonate

Fact 1: Most mollusks have shells.  Fact 2: Coral reefs and shells are made of calcium carbonate.  Given the two facts above, what do mollusks contain?
****
A: Calcium carbonate

Fact 1: Erosion causes a river to become deeper and wider.  Fact 2: Weathering and erosion continue to shape it today.  Given the two facts above, weathering causes what to become deeper and wider?
OPTIONS:
- a landslide
- Sediment
- a mountain
- a volcano
- soils
- rock
- flooding
- a river
a river

Fact 1: Electricity sometimes is used for heating buildings.  Fact 2: Hospitals incorporate most types of technical systems encountered in other types of buildings.  Given the two facts above, what is electricity sometimes used to heat?
OPTIONS:
- space
- hospitals
- waves
- direct energy
- energy
- Light
- condensation
- clouds

Answer: hospitals

Question: Fact 1: Cold fronts cause thunderstorms as they pass by.  Fact 2: If cold air is advancing on warm air, the front is called a cold front.  Given the two facts above, which situation can cause a thunderstorm?
OPTIONS:
- Fog rising over a lake
- pressure differences.
- Earth's axis of rotation is tilted
- Setting up lightning rods
- Cold air advancing on cold air
- Cold air advancing on warm air
- Changing the angle of the sun
- fall moving to winter
Answer: Cold air advancing on warm air

input: OPTIONS:
- destroying life
- classification system
- an organism's body
- respiratory and circulatory
- animal habitats
- ambulatory systems
- social security system
- the environment Now, answer this question: Fact 1: Air pollution harms the respiratory and circulatory systems.  Fact 2: Air pollution is caused by lots of different pollutants.  Given the two facts above, what systems are pollutants bad for?
A:
output:
respiratory and circulatory