In 1957, Brazil imported wild African honeybees to help increase honey production. The bees escaped and became established in the wild, displacing some native honeybee populations and leading to a reduced honey supply. These African honeybees could be described as .

1) one variable is tested2) a control is used

Okay, i don't know if you have any options to choose from, but the word imprudent basically means careless, rash, unwise, misguided, foolish, etc.it means that if douglass struck back against master covey, it would be a stupid decision as he would be killed afterwards.