Environmental Science
The order of succession in a hydrosere is

Rooted aquatic plants-> phytoplankton->Free floating stage->Reed swamp stage->Sedge Meadow stage-> wood land stage-> Climax forest
phytoplankton->Rooted aquatic plants->Free floating stage->Reed swamp stage->Sedge Meadow stage-> wood land stage-> Climax forest
Rooted aquatic plants-> phytoplankton->Free floating stage-> Sedge Meadow stage-> Reed swamp stage-> wood land stage-> Climax forest
phytoplankton->Rooted aquatic plants->Free floating stage->Reed swamp stage-> wood land stage-> Sedge Meadow stage-> Climax forest

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Environmental Science
Ecology is

The study of the relationships between organisms and their environment
The science that studies the evolution of life,
The study of the environment in the absence of humans
Integrates both social and natural sciences to help us understand how the earth works,

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