D- weight is a measure of the force of gravity on objects
Not everything is one type of element. There are compounds, simple ones like water and complex ones like wood, that exist on Earth and makes life more diverse.
I think you might be thinking of the different folding patterns of proteins. It begins with primary structure, then secondary, then tertiary, and finally quaternary.
Tidal volume was the measure of air that regularly enters the lungs amid calm relaxing. The Expiratory Reserve volume was the measure of air you can powerfully breathe out pas an ordinary tidal termination. Then, the vital capacity was the measure of air a man can move into or lungs and is the entirety of the considerable number of volumes aside from leftover volume. Amid practice is the point at which the tidal volume could increment because of the additional carbon dioxide
