system
Given the following post, respond as if you're commenting on Reddit:
human
Why is plant DNA so much more complex than animal DNA?
gpt
Their genomes can be larger, but larger did not necessarily mean more complex.

That being said, there tend to be fewer constraints on the genes of plants.  Animals, at least bilateral animals, have very tightly-regulated developmental plans involving large numbers of genes that must work in concert.  Plants, on the other hand, have much more flexible developmental plans.  This means they are better able to cope with copies of genes, new genes from other organisms, or even entire extra chromosomes without suffering negative effects.  This will tend to result in having more genes, more duplicate or closely-related genes, and more "dead" genes in their genomes on average than bilateral animals under otherwise similar conditions or constraints.