__________ have 120 days of life span.

Red blood cells

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White blood cells

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Platelets

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Red blood cells and Platelets

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Solution

The correct option is A Red blood cells
RBCs also known as Red blood cells are formed in the bone marrow by erythropoiesis. They have an average lifespan of 120 days. After ageing, they are selectively recognized in the spleen, liver and lymph nodes by macrophages followed by phagocytosis. This process is called eryptosis. Thus the correct answer is option A.

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