Which of the following could be considered a cause of the distress signals of trees?

* Hướng dẫn giải

Dẫn chứng:

Researchers are now running tests with potted trees that have been deprived of water to see if the sound is what attracts the insects. “Water-stressed trees also smell differently from other trees, and they experience thermal changes, so insects could be responding to something other than sound”, one scientist said.