Q.

………….differentiates between five stages of human development: In the first, people use energy of their own muscles.In the second, they use energy of domesticated animals’.In the third; they use the energy of plants (agricultural revolution). In the fourth, they learn to use the energy of natural resources: coal, oil, gas. In the fifth, they harness nuclear energy.

A. eric s. raymond
B. george b.selden
C. leslie white
D. richard stallman
Answer» C. leslie white
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