"Aliveness" isn't anywhere in the definition of sentience. I can perfectly well imagine a sentient system that does not grow, metabolize or reproduce.
And "responds to input" isn't really the same thing at all as "capable of feeling sensations" (though, like many definitions, the line between the two is fuzzy, hard to pin down, and possibly context dependent.)
Life itself is a notoriously tricky thing to define definitively.
And "responds to input" isn't really the same thing at all as "capable of feeling sensations" (though, like many definitions, the line between the two is fuzzy, hard to pin down, and possibly context dependent.)
Life itself is a notoriously tricky thing to define definitively.