A basic experiment involves a minimum of participant group(s). a. one
b. Two
c. three
d. four

A basic experiment involves a minimum of two participants group(s). Simple or basic experiment are ones that researchers use to determine if changes in one variable might lead to changes in another variable. In these experiments looking at the effectiveness of a new medication, for example, study participants may be random.

Explanation:

answer; (d) one tectonic plate plunges beneath another; (most common,convergent boundaries)

answer; /// i believe the correct answer is (when one group has an extremely high score at pretest;