5. Identify the feedback mechanism that maintains your body temperature when your surroundings are very hot.

which is an effect of short-term environmental changes? a) adaptation b) speciation c) extinction d) death (5 points)

How many electrons can occupy any electron orbital?

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