Which of the following properly describes motion by comparing it to a reference point? A. the hands of a clock compared to the numbers on the clock. B. The distance of a race car travels compared to the time of travel C. The speed of a bicycle compared to the direction of travel D. The velocity change of a train compared to time of travel

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