Structural adaptations are physical changes in an organism's body that help it to survive in its environment. For example, a polar bear has a thick coat of fur that helps it to stay warm in the Arctic cold.
Behavioral adaptations are changes in an organism's behavior that help it to survive in its environment. For example, a bird migrates south for the winter to avoid the cold weather.
Both structural and behavioral adaptations can be inherited from parents to offspring. This means that organisms that are better adapted to their environment are more likely to survive and reproduce, passing on their advantageous traits to their offspring. Over time, this process of natural selection can lead to significant changes in a population.