Which statement is not connect for a convex mirror? (a) Image distance is always positive. (b) The object distance is with negative sign. (c) behind the memor -Always forms an imagebehind the mirror (d)The focal length is always negative.

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