With Your Own Eyes

@bigdoggproblem said
Possible? Yes.

Our planet may have been seeded with organic compounds housed in meteors or other debris.

Yes, indeed.

There is also the interesting premise that we evolved out of the waste left behind by visiting aliens.

@ghost-of-a-duke said
Yes, indeed.

There is also the interesting premise that we evolved out of the waste left behind by visiting aliens.

...which leads to the colorful saying, "not bad, for a pile of fermented alien turds!"