What During this state man used simple tools to hunt animals and vegetation?

You're describing the Paleolithic Era, also known as the Old Stone Age. This period of human history, which lasted from roughly 2.6 million years ago to 10,000 BCE, is characterized by:

* Simple tools: Humans in this era developed and used tools made primarily of stone, bone, and wood. These tools were crucial for hunting, gathering, and survival.

* Hunting and gathering: Paleolithic humans relied heavily on hunting animals for food and gathering plants, fruits, and roots.

* Nomadic lifestyle: They were nomadic, constantly moving in search of food and resources.

This era saw the development of early forms of human society, language, and art. It's considered a pivotal period in human evolution.