Early humans used rocks as tools to make other things as well as to construct buildings. why was it better for them to use rocks than another material such as wood?

In stage 2 farmers used the land primarily to grow food for their families and their small communities.

All of the following statements about the biosphere are true except: a. light and heat from the sun do not affect the biosphere. b. the biosphere gets resources from earth's crust, hydrosphere and atmosphere. c. like "biology", the name for the biosphere comes from the greek word for life. d. the biosphere includes all living organisms on earth's surface.

What does 2[tex] {2}^{ - 4} \times {2}^{ - 2} [/tex]