Why do the walls of the trachea not collapse when there is less air in it ?

Glutamic acid: hydrophilic or hydrophobic? positive, negative, or neutral? valine: hydrophilic or hydrophobic? positive, negative, or neutral?

Explain why in any given geographical region, women tend to have lighter skins( by 3-4% on average) than men?

Drag each label to the correct location on the table. each label can be used more than once. decide whether each statement describes saturated fat, unsaturated fat, or both saturated and unsaturated fats.