cells
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11. All of the following are characteristics of red blood cells except:
(1) Biconcave disc shaped (2) produced in the bone marrow (3) do not contain a nucleus
or mitochondria (4) cytoplasm is filled with a red iron-bearing pigment (5) defend the
body from pathogens
The answer is number 5: defends the body against pathogens. Red blood cells do not defend the body, white blood cells do. Red blood cells' purpose is to carry oxygen to the rest of our body.
