Shabbir added an unknown substance to a bottle of water and shook the bottle until the two substances were combined. Then he set the bottle aside for 30 minutes. When he came back, the unknown substance had settled on the bottom of the bottle, and the water had risen to the top. Based on Shabbir’s experiment, what can you tell about the unknown substance? A It is hydrophilic. B It is a type of oil. C It is hydrophobic. D It is a homogeneous solution.

Asample of digestive juice was removed from the stomach of a pig. the juice was placed in a test tube along with some grains of wheat. a second test tube was set up containing an equal number of wheat grains, with distilled water rather than digestive juice. the test tubes were kept for 8 hours at 40 degrees c. after 8 hours, the grains inside the digestive juice had broken into tiny particles. the grains of wheat, in the water, were wet but otherwise unchanged. what is the control group?