puzzle 1

4. the most important contribution of plants to the lives of humans
7. pine trees and spruce trees are examples of ________
10. plants are photosynthetic eukaryotes that evolved from ________
11. thorns, spines and toxins are examples of things used by plants for ________
12. these plants usually have large leaves, they have vascular tissue, and produce spores, but they do not produce seeds

1. type of interaction between organisms in which both members benefit
2. mosses, liverworts, and hornworts are small plants without vascular tissue, and are referred to as
3. the technical term for flowering plants
5. type of interaction between organisms in which one member is harmed and the other benefits
6. a plant with a life span that lasts longer than one year is called a…
8. flower part that produces pollen
9. this is made by plants, and humans use it for the energy it contains