Question

which best explains why blood is considered to be a suspension?
○ it has nutrients that cannot be dissolved.
○ it contains particles that can settle out.
○ it has nutrients that are dissolved in its liquid portion.
○ it contains particles that mix on a molecular level.

Explanation:

A suspension is a heterogeneous mixture where particles are large enough to settle out over time. Blood has cells (like red blood cells) that can settle (e.g., in centrifugation). Option A is incorrect as nutrients in blood can dissolve. Option C describes a solution (dissolved nutrients), not a suspension. Option D describes a solution (molecular mixing), while suspensions have larger particles that don't mix at molecular level. So the key property of a suspension (particles settling) is what makes blood a suspension.

Answer:

B. It contains particles that can settle out.