describe the contribution early people made ot later civilization?
Oh my! Your question is so broad that it's unanswerable.
Early people? When? Where?
Early Mayans made contributions, as did Cro-Magnon, Egyptian, Mesopotamian, Chinese, Indian, Africans, etc.
If you clarify your question, we'll be glad to help you.
Or it might be simpler for you to check your text book.