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Blood is considered a suspension because it contains particles that can settle out. A (heterogeneous) suspension is defined as a mixture between a liquid and particles of a solid. ... Blood cells separate and settle from the plasma, the watery part of the blood.
crimsonrose1996

Answer:

Because platelets and other things are "suspended" in the plasma.

Explanation:

When blood is put into a centrifuge it separates into its separate components (eg: Red blood cells, plasma, White blood cells, platelets, etc)

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