Final answer:
Blood is a colloid, a type of heterogeneous mixture where the particles do not settle upon standing. The correct option is A) colloid
Step-by-step explanation:
Blood is a colloid, which is a type of heterogeneous mixture. A colloid consists of particles with diameters between about 2-500 nm that are distributed throughout a second phase without separating on standing.
Blood fits this description as it is made of cellular components like red blood cells, white blood cells, and platelets, all suspended in plasma. These cellular components do not settle out when the blood is left undisturbed, as would be the case in a suspension.
Moreover, because of its particle size and the fact that blood exhibits the Tyndall effect (scattering of light by particles), it indeed qualifies as a colloid rather than a homogeneous compound or heterogeneous compound comprising larger particles. The correct option is A) colloid