please answer question 4 and 5

Define microevolution. Explain how the bottleneck effect and the founder effect each affect microevolution. Be sure you demonstrate your understanding of these three concepts in your answer. 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? Of the three general outcomes of natural selection, this example illustrates _______ selection.