Blood does not clot inside blood vessels due to the presence of -----------

Options :
  1. Vitamin K
  2. Fibrinogen
  3. Thrombin
  4. Heparin
Answer and Explanation :-

Answer: Option 4

Explanation:

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He cursed himself for having assumed the weather would be sunny. Perhaps it was the result of evolution, he thought--some adaptive gene that allowed the English to go on making blithe outdoor plans in the face of almost certain rain.
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