A hypothesis is a possible explanation or answer to a question. Hypotheses should be testable. Which of the following sentences is the best hypothesis?
A.
If a person falls asleep, then their heart rate will decrease.
B.
If a pillbug becomes frightened, then it will roll up into a ball.
C.
It is better to live in a city than in the country.
D.
Why are plant leaves green?
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