I need a four page essay on the following questions. No longer than a page for each topic (can be a little shorter than a page).
1. Examine disruptive, stabilizing and directional selection in natural selection.
2. Describe sexual selection and the concept of balanced polymorphism.
3. What are animal "body plans"? What kinds of animal body plans are there? What are some fundamental trends in animal evolution (three or four)?
4. What is speciation, and how does it happen?
Part II. Shorter answers, a couple of lines for each item. The last one, about fishes, might be a little longer.
6. Why do scientists generally think that birds and reptiles are closely related evolutionarily?
7. What are amniote eggs, what advantages do they provide, and which species have amniote eggs?
8. Characterize Paleozoic, Mesozoic and Cenozoic eras in the earth's history.
9. What happened to dinosaurs? Did they all go extinct?
10. Describe annelids.
11. Describe a scientific scenario to describe how fishes may have been able to survive out of water.