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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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