(15) What is the name of the iron-containing protein that gives red blood vessel their color?(A) hemocyanin(B) pyrite(C) hemoglobin(D) myoglobin

(18) During the propagate ion of a nerve ion of a nerve impulse, the action potential results from the movement of(A) K⁺ ions from intracellular fluid to extracellular fluid(B) K⁺ ions from extracellular fluid to intracellular fluid(C) Na⁺ ions from extracellular fluid to intracellular fluid(D) Na⁺ ions from intracellular fluid to extracellular fluid