Ahypothesis 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?