Title says it all.
inb4Humanity
Edit: Not remove from memory; they just immediately die out.
For me, ticks. Hate those freaking things.
Edit: I swear, if one more person says spiders or snakes...
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Mosquitos, I'm pretty sure they serve no purpose in life....o wait, yes they do, they transport parasites. Other than that, I think the world would be fine without them