One possible explanation for why humans are humans and chimps are chimps despite the great similarities in their gene-coding sequences is?

Take a sentence of three-letter words. "The cat sat the mat and big dog ran bit cat." Take out the first "t". "Hec ats att hem ata ndb igd ogr anb itc at." Nonsensical in the most profound sense. This happens so often in the countless genetic sequences, that while the percentage difference is minute, the actual effect is staggering.