What are the characteristics that make elements different from compounds? give two examples of each that exist in the human body and explain their function

Elements are standalone atoms whereas compounds are two or more bonded elements. H2O is water and is a compound used to hydrate the body. Carboxyl is a compound found in fatty acids and amino acids. Carbon is an element in the body as well as nitrogen. Carbon is the building block for most cells. Nitrogen is found in nucleic acids that make our DNA

The activity series is shown in the attached picture. if the element is below the other, then you can displace the other. following the activity series as a guide, the reactions are as follows: nickel and aluminum chloride3 ni + 2 alcl₃  → 3 nicl₂ + 2 albarium and copper bromideba + cubr  →  no reaction because cu is less oxidizable than bapotassium nitrate and aluminum3 kno₃ + al  → al(no₃)₃ + 3 ksodium phosphate and zincnaso₄ + zn  → znso₄ + na

The correct answer would be b) volume versus temperature, because they are also directly proportional.