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Beyond these basic, universal features, eukaryotic genomes vary dramatically in terms of size and gene counts. Even so, genome size and the number of genes present in an organism reveal little about that organism's complexity (Figure 1).ne pg is equivalent to approximately 1 billion base pairs.) Therefore, genome size is clearly not an indicator of the genomic or biological complexity of an organism. Otherwise, humans would have at least as much DNA as the marbled lungfish, although probably much more.
Making the world better, one answer at a time. For one thing, multicellular organisms can live longer, allowing them to achieve more complexity. Multicellular organisms can also have specialized systems and cells within them (eg red blood cell, white blood cell, brain, etc) that single-celled organisms cannot have.aking the world better, one answer at a time. For one thing, multicellular organisms can live longer, allowing them to achieve more complexity. Multicellular organisms can also have specialized systems and cells within them (eg red blood cell, white blood cell, brain, etc) that single-celled organisms cannot have.