Answer
Genomic library contains both coding & non-coding regions of an organism whereas cDNA library contains only expressed gene sequences (Coding sequence). As genomic library contains both coding & non-coding regions, genomic library is larger than a cDNA library.
Work Step by Step
Genomic library contains both coding & non-coding regions of an organism whereas cDNA library contains only expressed gene sequences (Coding sequence). As genomic library contains both coding & non-coding regions, genomic library is larger than a cDNA library.