Wildlife biologists are attempting to monitor the population size of the insect pest known as the gypsy moth (lymantria dispar) during the summer months. to estimate the total population size of these insects living in a 50 square kilometer forest, biologists have sampled 10 random trees, counting the number of eggs and larvae on each selected tree. which factor should be modified to improve the overall experimental design? a) the sample size should be increased. b) data should be collected all year long. c) weather conditions should be controlled. d) researchers should include other insect species.