Food webs such as the one shown were first used in 1927 by the animal ecologist Charles Elton. The food web below represents the feeding
relationships among organisms in an Alaskan ecosystem. An
environmental change that removed which of these organisms from the
ecosystem would cause the most instability in the ecosystem? *

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.