Answer:
The correct answer will be option- E.coli bacteria
Step-by-step explanation:
Gene density refers to the ratio of the number of genes/ million base pairs.
The gene density helps us understand the complexity of the organism as the simple organism like prokaryotes possesses high gene density as compared to eukaryotic organisms.
In the given question comparing the E.coli with other eukaryotes shows that genes present per base pairs lies in 500-1000 genes/Mb while mammals posses 12-15 genes/Mb.
This happens as the bacterial gene lacks the non-coding sequences called introns which are found in the eukaryotic genome.
Thus, E.coli bacteria is the correct answer.