How do fossils demonstrate evidence of evolution? A. They show that ancient species share similarities with species now on Earth.

B. They show evidence of species that are now extinct.

C. They are the primary source of evidence of natural selection.

D. Fossils reveal that many species have remained unchanged for millions of years.

Wetlands form where water and land meet. a lake with a wetland fringe can fill in with decayed plant and animal material to become a wet meadow. a pond can fill in to become a bog or fen. sediment can fill in a river marsh to become a swamp.flooding of coastal lowlands from rising sea levels has created broad coastal marshes that are protected from wave action by barrier islands or reefs. coastal wetlands also form when rivers deposit sediment as they reach the ocean. plants then take root and hold the soil firm against the forces of tides and waves.