Which of the following statements best explains the discovery that a complex human has roughly the same number of genes as the simple nematode C. elegans?(A) The unusually long introns in human genes are involved in regulation of gene expression.(B) More than one polypeptide can be produced from a human gene by alternative splicing.(C) The human genome has a high proportion of noncoding DNA.(D) The large number of copy-number variants (CNVs) in the human genome provides a great deal of genetic variability.

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