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B
Natural selection
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C
Survival of the fittest
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D
Variations
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Solution
The correct option is A Inheritance of acquired characters
The 'theory of use and disuse' of Lamarck, advocated the idea that animals acquired characteristics after using certain physical traits constantly. For example, he believed that the reason why necks of giraffes were long, was because they stretched to reach leaves on high trees
So, the correct answer is 'Inheritance of acquired characters'