Imagine a genomic researcher who is analyzing the genome of different types of cats. She finds that a particular sequence in the North American Bobcat genome is identical to a sequence found in the common house cat, whereas most other sequences between the genomes of these cats differ at many nucleotides. Bobcats and house cats diverged an estimated 6.8 million years ago, plenty of time for mutation to generate DNA sequence variation. Which statements could explain the identical sequence in these otherwise differing genomes