this is a really good question. I would say its both because lettuce if sort of part of a plant so its both biotic and abiotic.
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Everything in a salad is biotic, that is, it once was a living plant or animal.
Lettuce is biotic. It is a plant so there for is alive. Or at least has been alive
its a abiotic because its not a living thing
All living things are biotic factors.
Abiotic Abiotic