The acidity of a solution reflects the concentration of free hydrogen ions in the solution.

Guanine.

 Divides the body into superior and inferior portions.

Provides a ridged framework to support the body and stores minerals.

Buffers resist abrupt and large changes in the pH of body fluids by releasing or binding ions.

Chest.

Functional protein.

Identify the correct property. Combined number of protons and neutrons in an atom.

Prevents water loss, entry of germs into the body and synthesizes vitamin D.

Usually, the first one or two letters of an element’s name.