You push a boulder 6 meters across the yard with a force of 500 N. How
much work have you done?

What are some things that limit population growth?

At which point is crust neither created nor destroyed? island chain mid-ocean ridge divergent boundary transform boundary

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