What is the living layer of a tree trunk that can still carry water and food?

The living layer of a tree trunk that can still carry water and food is called the cambium. This thin layer of actively dividing cells lies just beneath the bark and is responsible for the production of new phloem and xylem tissues. The phloem transports nutrients produced by photosynthesis, while the xylem carries water and minerals from the roots. Together, these layers play a crucial role in the tree's growth and overall health.