Problem:OPTIONS:
- alpacas
- bacteria
- animals
- polar bears
- phytoplankton
- rabbit
- viruses
- humans

Fact 1: Mammals can also generate little bursts of heat by shivering. Fact 2: Polar bears are mammals. Given the two facts above, what can generate little bursts of heat by shivering?
****
A: polar bears

Fact 1: Evolution occurs by a process called natural selection. Fact 2: Evolution is a sequence of variation and selection. Given the two facts above, what produces variation?
OPTIONS:
- animals
- evolution
- pollen
- environment
- a doorbell
- movement
- seasons
- competition
evolution

Fact 1: Viruses often infect bacteria. Fact 2: Infected birds spread the bacteria in their droppings. Given the two facts above, viruses often can spread bacteria through what?
OPTIONS:
- the skin
- microscopes
- contamination
- covering
- washing
- alveoli
- droppings
- coating

Answer: droppings

Question: Fact 1: Mollusks are a major food source for other organisms, including humans. Fact 2: Interestingly, a squid is also a mollusk. Given the two facts above, what do humans eat?
OPTIONS:
- Kelp
- sugar
- legumes
- food
- Eyes
- Coral
- animals
- Squid
Answer: Squid

input with options: Fact 1: Aflashlight requires a source of electricity to produce light. Fact 2: Batteries are a very handy source of power. Given the two facts above, what requires a battery to produce light?
OPTIONS:
- peachleaf willow
- a dog
- electrically
- a cat
- a flashlight
- energy
- another battery
- heat energy
output: a flashlight

Problem: OPTIONS:
- acetic acid
- Hemoglobin
- Fructose
- barnacles
- animals
- Estrogen
- Pesticides
- Baby spray
Q: Fact 1: Sex hormones are chemical messengers that control sexual development and reproduction. Fact 2: Estrogens are female sex hormones. Given the two facts above, which chemical controls sexual development and reproduction in females?
Answer:
Estrogen