Which of the following is an example of a mixture?

oxygen
air
O hydrogen
water

The length of the path between two points is what

Witch one is it soo it the the question b.a,b,c,d

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.