1. a vertical column of elements in the periodic table 2. 1/12 the mass of a carbon-12 atom 3. a horizontal row of the periodic table 4. dalton's atomic theory included the idea that the atoms of different elements can chemically combine in ratios

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