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It could be said that mosquitoes help to spread viri that inadvertantly add their own RNA into your chromosomes. This added RNA will find its way into the midst a gene or a gene promoter.
These types of occurances do, in a way, help organisims to evolve. We may owe our own evolution to a mosquito-like creature.
Now, it is unfortunate that they do spread diseases that kill millions of people, though their effects in the long run are thought to better a specie. You can leave that up to your own interpretation.
-SF
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