Final answer:
The three primary traits associated with the European Mesolithic are the transition to smaller chipped stone tools, a decrease in art, and the domestication of dogs.
Step-by-step explanation:
During the European Mesolithic, there are three primary traits that were associated with this time period. Firstly, there was a transition from using large chipped stone tools to smaller chipped stone tools called microliths. This transition reflects a shift towards a more hunter-gatherer culture. Secondly, there was a decrease in the amount of art attributed to the Mesolithic compared to earlier and later periods. However, certain regions did develop distinctive pottery during this time. Lastly, the Mesolithic is significant for the domestication of dogs, which became companions to humans during this period.