Answer:
i thin its a solution with the pH of 3
Explanation:
i don't understand the third choice
Answer is: Proteins-growth and repair of cellular structures.
Proteins are macromolecules made of amino acids (usually 20 amino acids) and they are main structure molecules of all living cells.
Lipids and sugars (glucose) are main source of energy in every living organism and they are used as the cell's energy reserves.
All group 7 elements are members of the halogen family, seen on the periodic table of elements. Such as : F, Cl, Br.
