Which of the following factors contributes to reemerges of disease more than the appearance of a new disease?
misuse of medication
exotic animal trade
changing environments
humans entering new land

Cathy hypothesized that corn would not grow in mud. to test this hypothesis, she took corn kernels and placed 5 in mud, 3 in soil, and 2 in water. to her surprise, the kernels in the mud grew faster than the kernels in the soil. what error might have caused these unexpected results? a. wrong hypothesis b. not enough variables c. undefined control d. too many variables