Fact 1: Secondary growth forms secondary vascular tissues and bark.

Fact 2: Some, such as bamboo and palm trees, have secondary growth.

Given the two facts above, answer the question "What forms secondary vascular tissues and bark?" with the following options: 
- palm trees
 - tulips
 - In their leaves
 - ferns
 - shrub beds
 - peonies
 - rhubarb
 - Most plants


 

 palm trees        