The organ above is responsible for filtering wastes from the digestion of proteins and cleaning the blood of excess salts. it is found in the lower back. it is the and is part of the system.
a) liver; excretory.
b) liver; digestive.
c) kidney; excretory.
d) kidney; digestive.

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