<span>The
answer is A. The reduction in variety reduces the number of alleles for
each gene in the gene pool. This reduces the variations in the phenotypes of the crops. A disadvantage of this phenomenon is that it
would be difficult for the crops to withstand
environmental changes and calamities because there is no wide variation on
which natural selection could act upon to
enable the crops to adapt to these changes.</span>
Answer:
1. give up 1
2. give up 2
3. give up 3
4. gain 3
5. gain 2
6. gain 1
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