3. The island of Rum in Scotland had wolves and trees 500 years ago. It now has neither. a. Offer one hypothesis for the current condition based on the concepts of keystone species and trophic cascades b. Suggest one way to test the hypothesis.

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?