What characteristic is common to all natural barriers?

Natural barriers, such as wetlands, dunes, and coral reefs, all share the characteristic of enhancing the resilience of coastal regions. These ecosystems play a significant role in absorbing wave energy, reducing erosion, and providing habitats for diverse wildlife. By acting as buffers against storm surges and rising sea levels, they help protect coastal communities from the impacts of climate change and extreme weather events.

Natural barriers are not man-made, so the notion that they all originate from human construction is incorrect. They are also not confined to tropical climates; they exist in various forms across different environments, including temperate and polar regions. Additionally, natural barriers do not rely on concrete or artificial materials, further emphasizing their organic nature. Thus, the ability to enhance resilience is a key feature that defines all natural barriers.