1. What are deuterostomes and protostomes, and how are these concepts useful in biology? (Forget which opening comes first in development. The concept is much more profound than that!)
2. What are seeds and some advantages of seeds, compared to what predated them?
3. what are homologies and analogies? What do they teach us about the history of life on earth?
4. In what respects have plants been necessary for animals to evolve?