5. Because of prolonged drought, the trees on an island are producing nuts that are much smaller with thicker and harder shells. What will happen to the birds that depend on the nuts for food?
6. What is meant by“ survival of the fittest” and how does it relate to evolution? Are these two concepts the same or different? Justify your answer and be sure to define both concepts adequately.
7. Define and compare natural and artificial selection, including the source of selection pressure and the traits selected for. Provide a specific example of each
9. Huntington ' s disease is a dominant disorder that causes progressive deterioration of brain cells and eventually death. Even though this is a fatal disease and a dominant one, it has persisted in the human population. Explain the reason that Huntington ' s has not been eliminated.( You will have to look up information on the disease paying special attention to the age at which it is expressed. It is important to understand the significance of this.)