Which is a part of the cell theory?
cells come from pre-existing cells
cells have a nucleus
organisms with one cell must be seen with a microscope
organisms must have more than one cell to live

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