The heart, blood, and blood vessels combine to form which of the following?
A) a group of cells
B) an organ system
C) the smallest level of organization
D) an organ
E) an individual living entity
B) an organ system
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The spleen
A. filters damaged red blood cells from the blood. B. changes undifferentiated lymphocytes into competent lymphocytes. C. is necessary for life. It can't be removed without causing death. D. produces several different hormones with unknown function. E. has additional digestive functions.