The example that illustrates a species lacking the diversity to survive a catastrophic event is:
The Koala Bear only eats Eucalyptus leaves.
This is because the Koala Bear's reliance on a very specific food source (Eucalyptus leaves) makes it vulnerable to changes in its environment, such as habitat destruction or disease affecting these trees. In contrast, the other examples illustrate adaptability and diversity in diet, habitat, or physical characteristics, which can aid survival in changing conditions.