Water quality is a measure of the health of water supplies used for drinking and other important activities. Which human activity MOST directly affects water quality?

-powering homes

-fertilizing crops

-driving cars

-fishing

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