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B
Amoeboid
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C
Cuboid
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D
Spherical
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Solution
The correct option is A Disc Red blood cell, also called erythrocyte, the cellular component of blood, millions of which in the circulation of vertebrates give the blood its characteristic color and carry oxygen from the lungs to the tissues. The mature human red blood cell is small, round, and biconcave; it appears dumbbell-shaped in profile.