★ Cardiovascular System Quiz
Which of these items contains hemoglobin, which carries oxygen to all cells and removes carbon dioxide?
A. Leukocytes
B. Erythrocytes
C. Platelets
D. Plasma
Select your answer:

Topics:
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Immunity & Cancer › ViewWhich of the following immunoglobulins constitute the largest percentage in human milk?
A. IgM
B. IgG
C. IgM
D. IgA
Heredity › View
Different versions or forms of the same gene are called –
A. chromosomes
B. sex cells
C. nitrogen bases
D. alleles