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About question 5. I believe it is possible/likely that extraterrestrial micro-organisms have reached earth in meteorites, etc. However I doubt that inteligent extraterrestrial life has ever reached Earth.

The response to 5 is strongly negative.

It is quite possible that life on earth was seeded by low level life forms arriving via comets etc.

I interpret question 5 in the broadest sense. Namely, that possible micro-organisms carried here by, say, a meterorite, would be considered visitors. We still don't know if that has happened. There is no serious evidence that *intelligent* ET life has come to Earth.

To #3 & #5 I would answer "unlikely"