**NEED TODAY** The picture shows a protist, which is a single-celled organism. The structure labeled X on a single-celled organism is most similar to the A skin of a multi-celled organism. B brain of a multi-celled organism. C veins of a multi-celled organism. D stomach of a multi-celled organism.

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