Describe how the evolution of nerve and muscle tissue is related to one of the main characteristics of animals.

The nervous system is a set of cells specialized in the conduction of electrical signals. It is made up of neurons and glial cells. Neurons have the function of coordinating the actions of living things in the animal kingdom by means of chemical and electrical signals sent from one place to another in the organism. [3] [4] Most multicellular animals have nervous systems with similar basic characteristics, although with a very variable degree of complexity. Only animals that do not have well differentiated tissues and organs, such as porifers (sponges), placozoa