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Q1. All six animals share a common ancestor from approximately 350 millions years ago, from which they, or there most recent ancestor, diverged from in an evolutionary sense. (think this one is right) Q2. Homologous structures found in all six organisms would support phylogenic tree. Characteristics which did not arise due to selective pressure, but rather due to a common ancestory. What is an example of this in these marine animals? Flap like structures on their side - wings (penguin) and fins (fish)? Unsure. Q3. Divergent evolution. A variety of species with different physcial features emerged over a long period of time from a common ancestoral population/species. Therefore, since this is all characteristic of divergent evolution, the phylogenic tree depicts divergent evolution. (think is right) 4. Dolphins and killer whales. Share most recent common ancestor from 50 million years ago, and therefore most similar. (think is right) 5. Speciation (or adaptive radiation) 6. Examples? 7. Stream line body, etc. Species do not share a recent common ancestor, yet have similar structures with similar functions due to these organisms experiencing similar selective pressures. 12. difficulty drawing phylogenic tree CLEARLY