Simple, prokaryotic organisms have been on earth for over 3 billion years and have been able to grow and evolve into many different and successful prokaryotic organisms. which structure evolved in cells approximately one billion years ago that allowed for the forming of more complex, multicellular organisms?

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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.