Here's why:

* Vascular tissue: Rice has specialized tissues called xylem and phloem, which are the defining characteristics of vascular plants.

* Xylem: Transports water and minerals from the roots to the rest of the plant.

* Phloem: Transports sugars (produced during photosynthesis) from the leaves to other parts of the plant.

* Height: Rice grows tall, and vascular tissue is necessary to transport water and nutrients efficiently over longer distances.

* Complex structures: Rice has roots, stems, and leaves, which are all made possible by the presence of vascular tissue.

Nonvascular plants, like mosses and liverworts, lack these specialized tissues and are therefore limited in size and complexity.