Which is a characteristic of colloids? a. are homogeneous mixtures
b. have large dispersed particles
c. will settle out over time
d. are made up of at least two substances

D.are made up of at least two substances

Explanation:

B, have large dispersed particles

Explanation:

I almost thought it was d, but the text clearly reads "Colloids are mixtures in which one or more substances." Making the answer B, "relatively large solid particles"

Colloids are mixtures in which one or more substances are dispersed as relatively large solid particles or liquid droplets throughout a solid, liquid, or gaseous medium. The particles of a colloid remain dispersed and do not settle due to gravity, and they are often electrically charged.

practical process described pest part of scientific investigation.

because practical knowledge is powerful then therotical knowledge.