1. Haemoglobin
  2. Platelets
  3. Serum
  4. Plasma
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1 Answers

Answer: Option 2

The main job of platelets, or thrombocytes, is blood clotting. Platelets are much smaller in size than the other blood cells. They group together to form clumps, or a plug, in the hole of a vessel to stop bleeding.

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