Two reasons for the increasing demand for power are:

a] reduced efficiency in appliances
b] population growth
c] relaxation of government regulations
d] increased consumption
e] reduced resources
f] global warming
g] hole in ozone layer

population growth

relaxation of government regulations

increased consumption those are the answers

cardiovascular system

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i'm thinking (a) to keep sand in place; ////////////

explanation: a sand fence or sandbreak, like a snow fence, is used to force windblown, drifting sand to accumulate in a desired place. sand fences are employed to control erosion, sand dune stabilization, keep sand off roadways, and to recruit new material in desert areas.