Experiments sometimes include measuring the variable/concept twice. this technique is known as a sample and population primary test and secondary test pretest and posttest control and experiment

The correct answer is pretest and posttest .

A pretest/posttest experiment is an experiment that includes double measurements at multiple points in time. In this kind of test, measurements (measurement of dependent variable) are taken both before and after a treatment.

name and explain one of the event that occurs during meiosis that increases the variation in offspring even more than simple reproduction?