Brownian motion is not observed in a mixture that includes two phases. which best identifies the mixture? a colloid a suspension a solution an alloy

Answer is: a suspension.

Suspension is a heterogeneous mixture (solute particles do not dissolve), that contains solid particles (for example nickel sulfide or NiS) sufficiently large for sedimentation.  

The internal phase (solid nickel sulfide) is dispersed throughout the external phase (water).

Another example of a suspension is sand in water.  

B)- a suspension

Explanation:

took test on edg

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periodic trends is an atom that gets larger as the number of electronic shells increase, the radius of atoms increases as you go down a certain group in the periodic table of elements. in general, the size of an atom will decrease as you move from left to right of a certain period.