Will give brainllest if right

Air pollution is only caused by human activity, select the best answer from the choices provided ot of true or false

What would happen if the tubing with the yellow band was placed in a beaker of distilled water?

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