There is still room for doubt because they can never be too sure whether there is evidence for life found in the graphite!
There's no any exact scientific results and nobody currently know what will exactly happen, but some scientists suggested that the sun might expand and dies that leads to the end of the world but some says there will be a new sun being born and like that.
The two major parts of Photosynthesis are the Calvin cycle and the light dependent reaction.
A sudden inrush of water could over whelm animals and possibly kill them if the water is of a different type.
The answer is A: yes
Hope this helps