Due to the presence of haemoglobin in blood clots at any injured part of the body.
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when we injure ourselves and start to bleed, our bodies make sure that the bleeding soon stops by forming a clump of blood (a blood clot) that closes the wound.
but sometimes blood clots form in the bloodstream even though there are no external injuries, and blood vessels may become blocked as a result. this can lead to dangerous complications such as a heart attack or stroke.
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I don't know I thing it in the text
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