What a waste of space. . .

I understand the need for Flies, without them the whole Planet would be strewn with rotting carcasses(sorry it's a fact)so however annoying, I get it. But what on Earth is the point(and need in the big scheme of things)of Mosquitos and Ticks?. I say that whilst nursing 3 lumps on my neck from these Critters. I always have an allergic reaction to them. . . .What a waste of space