I've heard that some species of trees interact with other trees and will even respond to predation. How do trees do this without a brain?
user
Some plants do communicate with others, but often they just release volatile chemicals that diffuse through the air, or they might have some physical structure like a root network that sends signals.  However they might also have some kind of cellular signaling, such as in the roots.
assistant
I've heard that some species of trees interact with other trees and will even respond to predation. How do trees do this without a brain?
user
Some species of trees communicate with each other via chemicals, and also use root systems to communicate. This isn’t an intelligence-based communication so much as a "response to a stimulus."  Some plants are also known to actually help other plants nearby grow, which could be a type of communication.
assistant
I've heard that some species of trees interact with other trees and will even respond to predation. How do trees do this without a brain?