What is the peculiarity of the Mesolithic era?

The Mesolithic era is otherwise called the Stone Age era. The Stone Age is characterized by the following features. First, during the Mesolithic era, stone tools were widely used. Secondly, primitive norms of behavior are emerging, for violation of which punishment is provided. Thirdly, in the Mesolithic era, the rudiments of art appear – rock paintings testify to this. Fourthly, great progress at this time was observed in medicine – they learned how to treat some diseases. Fifth, the end of the Mesolithic is characterized by the beginning of the development of agriculture.