Final answer:
Blood is an example of a suspension because it has cells that can settle out of the plasma over time, a property characteristic of suspensions.
Step-by-step explanation:
An example of a suspension is blood. In a suspension, heavier substances are temporarily suspended in a liquid, and over time, they settle out through the process of sedimentation. Blood is considered a suspension because it contains cells that can settle out of the plasma upon standing, as seen in sedimentation rate tests. Contrary to salt water and rubbing alcohol, which are solutions, and cytoplasm, which is more akin to a colloid, blood exhibits the characteristic properties of a suspension.