saliva

German scientists studying young beeches and maples knew plants responded to predation, but they wanted to know if plants could tell the difference between a deer chewing their leaves verus being damaged by other factors like storms, or being trampled upon.

It might not be a great idea to use mouthwash right after working out, at least if you want to experience the blood pressure-reducing effects seen after exercise. Mouth bacteria play an important role in reducing blood pressure after we exercise, and using antibacterial mouthwash can get rid of it.