question: Given the fact "fog is formed by water vapor condensing in the air", what is the answer to "It's too foggy to see more than two feet on a highway. This is because of"

OPTIONS:
- ash from a volcano
- vapor of H2O condensed in the air
- helium vapor in the air
- a forest fire nearby

answer: vapor of H2O condensed in the air

question: Given the fact "a skinny beak is used for obtaining food by a bird from small spaces", what is the answer to "Hummingbirds gather nectar using their"

OPTIONS:
- bills
- wings
- hands
- feet

answer: bills

question: Given the fact "ethanol sometimes is made of corn", what is the answer to "Corn can sometimes"

OPTIONS:
- be grown in arctic environments
- be used as kindling
- fuel a steam locomotive
- fuel an economy car

answer: fuel an economy car

question: Given the fact "if members of a species are born then the population of that species increases", what is the answer to "if members of a species are born then the species what increases?"

OPTIONS:
- water
- community
- understanding
- food

answer:
community