The term which best describes a milkshake that contains pieces of chocolate cookies is: heterogeneous mixture.
A mixture can be defined as a combination of two (2) or more substances which are present in varied proportion and can be visibly seen with our naked eyes.
Generally, there are two (2) main types of mixture and these are;
A heterogenous mixture can be defined as any mixture that has a different (non-uniform) composition and properties throughout any given sample of the mixture.
This ultimately implies that, the constituents of a heterogenous mixture always remain separate in the sample and as such comprises two or more phases.
In this context, the pieces of chocolate cookies wouldn't dissolve completely in a milkshake and as such they remain separate, forming a heterogenous mixture.
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