Final answer:
In mixtures with two phases, Brownian motion is not observed in a solution but can be seen in colloids and suspensions.
Explanation:
In a mixture that includes two phases, Brownian motion is not observed in a solution because it is a homogeneous mixture where particles are smaller and do not scatter light. However, it can be seen in colloids and suspensions. Colloids have particles that are larger than in solutions but do not settle out, while suspensions have visible particles that can settle.
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