Homologous structures are similar structures with different functions derived from evolution. The rhino and the koala's forelimbs have the same basic structure but serve different purposes. The koala uses its arms to grasp tree branches and hold its young while the rhino uses its forelimbs for walking and running. The mom koala in the photo above shows altruistic behavior, because she is going out of her way to care for her young. She feels it is her duty to take care of her young and be selfless when doing so.
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