There is evidence plants are sentient as well. Is killing them ok?
There is evidence that plants may have cognition but not necessarily consciousness.
It is an interesting subject to be sure as is all of consciousness studies. I highly recommend subscribing to the Journal of Consciousness Studies if the topic interests you.
For explanations of why animals are conscious but plants (and incidentally computers) likely are not Christof Koch's The Feeling of Life Itself and Rodolfo Llinás' I of the Vortex: From Neurons to Self are great places to start.
Regardless, while it’s not impossible that plants may be conscious, we know that animals are so we should treat them as such.
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