Nerve tissue is present only in animals and absent in plants. What caused this feature of the animal

Nerve tissue is present only in animals and absent in plants. What caused this feature of the animal organism and what it testifies to.

Animal organisms are quite complex. They have many more organs and tissues than plants. Also, animals are able to move in search of food, good living conditions, sexual partners, and more. Therefore, they need a nervous system. Thanks to the nerves, signals of contraction are sent to the muscles and so the animals are able to move. Also, the nervous system allows animals to have reflexes and avoid dangers. With the help of nerves, a signal about irritation is quickly sent to the brain and the animal can quickly react to it.