1. The same homeobox DNA sequence is shared in the developmental genes of mice and fruit ?ies, even though these two animals diverged from each other evolutionarily about 550 million years ago. What does this high level of conservation tells us about the homeobox sequence?
2. Define homeostasis and give an example of a negative feedback loop.
3. List the organ systems that are directly involved when one eats a meal and explain how they are involved.