How do plants play an important role in preventing wind erosion? a. plants make the surrounding soil light and crumbly. b. plants make the soil easily transported by wind. c. plants hold the soil and slow down the effects of wind. d. plants the wind create unusual landforms such as ventifacts.

1. beginning with all chambers of the heart in the "relaxed" phase, describe the cardiac cycle in mammals, with systole and diastole of the atria and ventricles. for each time point in the cycle you select, state the following: • whether the atria and ventricles are contracting or relaxing • whether the av valves and semilunar valves are closed or open • whether the pressure in the atria and ventricles is high or low