Fact 1: Most modern gymnosperms are trees with woody trunks.

Fact 2: Gymnosperms are the most ancient seed plants.

Given the two facts above, answer the question "The most ancient what are trees with woody trunks?" with the following options: 
- it needs them
 - leafy greens
 - more abundant
 - Leeuwenhoek
 - flowering buds
 - pollen
 - graptolites
 - seed plants


 

        seed plants 