Complete separation of pulmonary and systemic circulation is required in order to provide A. increased cardiac output
B. increased ventricular contraction
C. Stronger ventricular contraction
D. more efficient oxygenation of the blood.

What does this experimental investigation lack

Select the word from the list that best fits the definition apparent movement of a star used to measure its distance from earth

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?