Question

fill in the blank question
the formed elements of the blood are platelets, erythrocytes, and five types of leukocytes, which include eosinophils, basophils, neutrophils, monocytes and

Explanation:

The formed elements of blood include platelets, erythrocytes (red blood cells), and leukocytes (white blood cells). The five types of leukocytes mentioned are eosinophils, basophils, neutrophils, monocytes, and lymphocytes. So the blank should be filled with "lymphocytes" as it's the fifth type of leukocyte.

Answer:

lymphocytes