>>You've been abducted by aliens.
Finally!
>>Before they get to the mandatory anal probing, they have some >questions on humanity for you.
As If I would know the answers! Wait a minute...Did you just say anal probing?
>>1/ What does the alien look like (ok, they aren't asking you this one)?
Based on what I know of Biology, I doubt they'll look like anything I can imagine...ok, they look like big bugs. Probably something in the cockroach family. I'll cower and apologize for squahing so many of their bretheren.
>>2/ What is humanities best trait and who best demonstrates it?
Oh God. Wait! That wasn't my answer! Humanities best trait is a sense of honor that causes us to do right by each other and ourselves. Honor that forces us to recognize that we have personal responsibility for our lives and our actions. Honor that causes us to be honest, upright citizens who walk gently upon the Earth. Honor that causes us to treat our fellow men and women with dignity and respect.
I cannot think of anyone who lives this way, although I'm sure there are some out there. 
>>3/ What is humanities worst trait and who most shows it?
Lack of basic human respect for our fellow human beings. This trait will be the downfall of mankind. Again no example; I know, It's a cop out!
>>4/ What is the best answer to the meaning of life that humanity has developed?
Existence actually has no meaning. When you think about it, it can be quite freeing. We are a silent scream. Until you can get your head around this you will live and incomplete, unfulfilled and totally neurotic life. That's why so many people claim they want to kill themselves - they are trying get some control over the fear of death and let it go so they can get on with the business of living and have some energy leftover to enjoy a sunrise.
Having said all that, I will admit that I live an incomplete, unfilfilled and totally neurotic life. And I know those of you with a strong faith will disagree with my take on the meaning of life. I respect that.
>>5/ The aliens will answer any one question to the best of their ability, what do you ask them?
Are there other aliens out there, how many, and what are they like?