What are the stages in the development of the most ancient man? What sciences and sources help scientists learn

What are the stages in the development of the most ancient man? What sciences and sources help scientists learn about the life of primitive people?

More than 2 million years ago, a skillful man came to replace the great ape that lived more than 3 million years ago in East Africa. The creature’s brain was somewhat larger than that of a great ape. A skilled man learned to create the first tools of labor. Homo erectus had an even larger brain, which descended from Homo sapiens about 1.5 million years ago. He moved on two legs, his arms became more agile, and his hands and fingers became mobile and flexible. Such a person could already make various stone tools. Communication and joint work contributed to the development of thinking and speech.
Archeology and artifacts found during excavations help scientists learn about the life of primitive people.

Remember: The process of learning a person lasts a lifetime. The value of the same knowledge for different people may be different, it is determined by their individual characteristics and needs. Therefore, knowledge is always needed at any age and position.