Scientists are testing how the biomass of several tissues changes when an animal gets various amounts of exercise. The research team raised two groups of mice: one group remained sedentary and another participated in intense daily exercise. After one month, they measured the mass of cardiac muscle tissue, smooth muscle tissue, skeletal muscle tissue, and neurons with and without a myelin sheath in each mouse. They found that the biomass of cardiac muscle tissue, skeletal muscle tissue, and myelinated neurons were higher in well-exercised mice, whereas they found no significant difference in the biomass of smooth muscle tissue or unmyelinated neurons. Which of the following graphs are in line with their results? The background image of each graph indicates the tissue type that the graph represents. (Click on all correct answers.)
