Answer:
Observable
Explanation:
An observable phenomenon leads to an hypothesis.
So,
There is a scientific consensus that life exists on other planets
and
The scientists only studied one meteorite
The first one because the other ones don't make sense, and because it is a scientific consensus. The latter because they only studied one, and imagine if they studied other ones...
I believe the first step in recording an impression is taking a photograph without casting.
1. A
2. B (not 100% sure though)
3. A or B
