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 .)