Here's why:

* Dominant Sporophyte: Gymnosperms have a dominant sporophyte generation, meaning the plant we see is the diploid sporophyte, not the haploid gametophyte.

* Vascular Tissues: They have well-developed vascular tissues (xylem and phloem) for transporting water and nutrients.

* Seeds Exposed on Cones: The most defining characteristic of gymnosperms is that their seeds are not enclosed within a fruit, but are exposed on cones.

Some common examples of gymnosperms include pine trees, fir trees, and cycads.