What are two of the things human ancestors used the sky for?

Explanation:I know Th at one of the reasons is that they would look at the sun to tell time.

brain development. a child's brain undergoes an amazing period of development from birth to three—producing more than a million neural connections each second. the development of the brain is influenced by many factors, including a child's relationships, experiences and environment.

explanation:

colors do exist. the color of the sky is actually violet; humans percieve the color of the sky as blue.