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प्रश्न
What is blood? Why is it red?
टीपा लिहा
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उत्तर
Blood is a red colour connective tissue that circulates in our body. Blood has an extra-cellular matrix called plasma, where red blood cells, white blood cells and platelets float. Blood is red because of the presence of haemoglobin. Haemoglobin is a red colour pigment, found in red blood cells.
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