Geologists have divided earth's history into time units, which are largely based on

a. fossils. b. climates. c. magnetism in rocks. d. evidence of erosion.

Which are practical examples of how people in the developed world could make a big difference in how much water they use check all that apply a. use lightbulbs that use less electricity b. consider using a composting toilet that does not use water c. avoid using your telephone during peak hours d. do not read books