Put the number by which one you answer answer only 5,6, and 7

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

During convection, less dense fluid rises and denser fluid sinks.

Which of the following is the earliest era of earth's geologic time scale? cenozoic mesozoic precambrian paleozoic