How do we know that plants and similar don't feel pain? As far as I see it

How do we know that plants and similar don't feel pain? As far as I see it

How do we know that plants and similar don't feel pain? As far as I see it plants just don't act like they're in pain, but that doesn't mean they aren't. They could just be very stoic about it.

Read another response by Cheryl Chen
Read another response about Knowledge, Mind