Select from the following. (a). palm trees; (b). tulips; (c). In their leaves; (d). ferns; (e). shrub beds; (f). peonies; (g). rhubarb; (h). Most plants;

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, what forms secondary vascular tissues and bark?
Answer:
(a).