Here's why:

* Lateral Meristems: These are plant tissues responsible for lateral growth, meaning growth in width or diameter. Think of them as the growth rings in a tree trunk.

* Secondary Tissues: These tissues are formed from the division of cells in lateral meristems, contributing to the thickening and strengthening of plant stems and roots. Examples include:

* Secondary Xylem: Responsible for water transport.

* Secondary Phloem: Responsible for food transport.

* Cork Cambium: Produces the protective outer layer of bark.

In contrast:

* Apical Meristems: Found at the tips of roots and stems. Responsible for primary growth, or the elongation of the plant. They produce primary tissues like the root cap, vascular tissues, and ground tissues.