input: OPTIONS:
- The atmosphere
- Ecosystems
- earth
- animals
- Impact crater
- Garbage
- humans
- Refuse containers Now, answer this question: Fact 1: Landfills have a negative impact on the environment. Fact 2: An ecosystem is an environment and all the members of that environment. Given the two facts above, what do landfills have a negative impact on?
A:
output: Ecosystems

Fact 1: Infection can cause bodily tissues to swell. Fact 2: HIV infection is a chronic lifelong infection. Given the two facts above, what can cause bodily tissues to swell?

OPTIONS:
- p53
- invisible light
- HIV
- skin
- AIDS
- HPV
- lung
- clouds

Answer: HIV

Problem: OPTIONS:
- parasites
- barnacles
- the body's largest organ
- major threat to health
- activated b cells
- resistance activities
- fur seals
- it keeps an organism warm
Q: Fact 1: Plasma cells are activated B cells that secrete antibodies. Fact 2: Antibodies are produced by plasma cells. Given the two facts above, what secrete antibodies?
Answer: activated b cells

Problem:OPTIONS:
- Tiny living cells.
- dead organisms
- smoking tobacco
- deoxyribonucleic acid
- single-celled organisms
- Body doubles.
- Negative balance.
- Crater impact.

Fact 1: Disease-causing microbes have a negative impact on the body. Fact 2: Microbes are tiny living cells. Given the two facts above, what can cause disease, and have a negative impact on the body?
****
A: Tiny living cells.

Fact 1: Aplanet rotating causes cycles of day and night on that planet. Fact 2: The gravitational pull of the major planets alters the orbital period from revolution to revolution. Given the two facts above, what causes day and night?
OPTIONS:
- chemical messengers
- The moon
- The ocean's waves
- chemical reaction
- Revolution around the sun
- The clock on the wall
- Evaporation of water
- Basic units of the plant body.
Revolution around the sun

Fact 1: Mammals can also generate little bursts of heat by shivering. Fact 2: All humans are mammals. Given the two facts above, what can generate little bursts of heat by shivering?
OPTIONS:
- rabbit
- goats
- bears
- humans
- clouds
- trees
- animals
- the sun

Answer:
humans