Why is DNA more complex in eukaryotes than bacteria?

DNA is more complex in eukaryotes than in bacteria primarily due to the presence of multiple linear chromosomes, as opposed to the single circular chromosome found in bacteria. Eukaryotic DNA is tightly packed with histone proteins to form nucleosomes, allowing for greater organization and regulation of gene expression. Additionally, eukaryotic genomes contain introns and undergo processes like alternative splicing, further increasing their complexity. This structural and regulatory complexity enables more intricate cellular functions and greater adaptability in eukaryotic organisms.