It is 18 cm tall. It produces spores. It grows in poor soil. It has a flat gametophyte.
A plant grows in a damp, marshy area filled with nonvascular plants and seedless vascular plants. Which characteristic indicates the plant is classified as a seedless vascular plant?

Options:
- It is 18 cm tall.
- It produces spores.
- It grows in poor soil.
- It has a flat gametophyte.

It is 18 cm tall.