Salinity of sea water is usually measured in parts per?

All phases of matter may have a fixed mass

Amino acids with hydrophobic r groups are most often found buried in the interior of folded proteins.true or false.

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