In trying to accumulate knowledge about the universe and to find common factors which underline and account for the facts that he knows,the scientist often chooses the method of the“controlled experiment.”If he wants to find out the effect of light（ ）growing plants,he takes many plants，as alike as possible.
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d experiment.”If he wants to find out the effect of light（ ）growing plants,he takes many plants，as a
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aning,and freedom consists in the chance to undertake the experiment for oneself in theland of oppor
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y into the nature of knowledge laid the foundations for the scientific method一the pursuit of truth
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y into the nature of knowledge laid the foundations for the scientific method一the pursuit of truth
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y into the nature of knowledge laid the foundations for the scientific method一the pursuit of truth