Brownian motion is not observed in a mixture that includes two phases. which best identifies the mixture?

Brownian movement is the movement of the molecules that are described as zigzag motion. A mixture that includes two phases that are distinct is called a suspension. It cannot be  solution because a solution is a homogenous mixture with no distinct phase separation. 

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Answer:

a. energy is absorbed in the reaction.

explanation:

if in a given reaction the energy of products is greater than the energy of reactants it means that reaction is endothermic and during the reaction, the energy is absorbed by reactants. in an endothermic reaction, the products have more stored chemical energy than the reactants. and in this reaction the reactants are more stable than products before the compounds with less energy are always more stable.