Which one of an intron and an exon is the reminiscent of antiquity???

Introns are the reminiscent of antiquity. This is because introns were present in the past organisms but during the course of evolution prokaryotes excluded them from their genome while eukaryotes retain them for functional advantages. Also they have been conserved because of their property of replication and dispersion.

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Introns are reminiscence of antiquity.

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