They're all younger than us... They have a very short lifespan.
Because its a good design and it doesn't need more than 7 to work and it's strategy is to basically mass produce itself and accept that 99% of them won't live long enough to reproduce. It is evolutionary spam.<br />
Humans on the other hand work on a different strategy.
I'm not sure a mosquito chooses anything especially the long term path of it's evolution.
Evolution is not ba<x>sed on anything of the sort. There is not guiding principle. It's just the fact that species change very, very slightly with every generation, and over time that leads to new species. The direction of the change is determined by environment. <br />
Mosquitos have thrived with 7 chromosomes, so they haven't evolved in the same direction we have.
We're not bulletproof 'cause evolution doesn't work that way. You'd have to shoot everyone in a specific, contained population once per generation for... say tens of thousands of years and let the survivors breed for that population to evolve a response to gunshot wounds.