Question 2 Some of the warming that has been observed over the 20th century can be attributed to
droughts.
Oglacial melfing.
O plant growth
human activity
Question 3

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.