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Humans at the time of 8000-1000 B.C knew that

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genes are responsible for heredity

allele is a variant form of gene

causes of variation was hidden in sexual reproduction

genes are responsible for variation

answer is C.

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Detailed Solution

Humans at the time of 8000-1000 B.C knew that one of the causes of variation was hidden in sexual reproduction. But they were not aware of genes and alleles.

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