photovol
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There is a ton of diversity even on this planet. At this point we aren't really even sure about abiogenesis vs panspermia as to how life got going on earth. While it's likely carbon based life, who knows what that looks like evolved on a different world. It may well be completely alien.
I also doubt we've been visited due to the distances involved and that pretty much every resource here is available in space. Why brave a often hostile biosphere with a big gravity well when you can just pull the same stuff off a lifeless place like a moon, comet, or asteroid? Unless they are looking for meat, there is just no reason to. Once we sent men into space, we could be interesting to them I suppose. But before that we were just another primative species with nothing to offer an advanced society. One that tended to be hostile to outsiders to boot.
If we have been visited, we're either a great big ant farm or a reality show to them.
We have been visited by several different extraterrestrial biological entities, at least that is what I believe wholeheartedly