Red blood cells are known as:
A. Leukocytes
B. Erythrocytes
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The three layers of the heart are as follows: A. Myocardium,pericardium,endocardium B. Myocardium,epicardium,endocardium C. Myocardium,endocarditis,endocardium D. Myocardium,exocardium,pericardium