Four ways can be exhibited as the following, 1) they provide nutrients/oxygen for the body, 2) they take wastes and other substances that harms the body, 3) the metabolism and other cell processes and 4) regulates and manages the body temperature.
From the choices, the elements that would be of priority are hydrogen, oxygen, and carbon. These elements may then react to form the necessities of a human life and other organisms which include water, carbon dioxide, and glucose.
Cell Wall
Explanation:
About 63% of the bacteria tested were Gram-negative, which means that they have a cell wall that is more resistant to certain classes of antibiotics than the cell walls of Gram-positive bacteria.
The gradual cooling if the body after death is ALGOR MORTIS