The soft layer just beneath the bark in tree trunks is called the cambium.

Here's why it's important:

* Growth: The cambium is a thin layer of actively dividing cells responsible for the growth of the tree in width. It produces new layers of xylem (wood) on its inside and phloem (inner bark) on its outside.

* Vascular connection: The cambium connects the xylem and phloem, allowing for the transportation of water and nutrients throughout the tree.

Let me know if you have any more questions about trees! 🌳