The two major components that make up the living tissue, blood, are:

a. Erythrocytes and leukocytes
b. Platelets and erythrocytes
c. Plasma and electrolytes
d. Plasma and formed elements

d
Rationale: a. These are formed elements.
b. These are formed elements.
c. Plasma is a component, but electrolytes are dissolved in plasma.
d. Correct.