Describe three things that a paleontologist must do to plan a fossil hunting expedition so that s/he is likely to find evidence to answer a specific scientific question. For each of these three things, describe why it is important to the success of the study.
2. Hox genes direct the development of an animal, helping to determine the animal's body plan. Describe how Hox genes also show evidence that all animals share a common ancestry?
3. Explain why complex multicellular animal bodies did not arise until around 600 million years ago.