Is might've a verb or noun

Which factors threaten the forests of north america?

How many plants are there how do you say them in spanish?

Which of the following is not prohibited by georgia law? a. crossing a dividing section, barrier, or unpaved strip, which separates two roadways   b. coasting with the gears or transmission of the vehicle in neutral when traveling on a downgrade   c. entering or leaving any controlled-access (interstate) roadway at authorized entrances