A) Emergent plant life, or pond pioneers, surround an open water lake. Some terrestrial plant life surrounds it as well.
B) Emergent plant life begins to move inward and submerge, filling up the lake. Sediment accumulates as the plants grow and die. Terrestrial plant life increases.
C) Sediment fills the lake basin, leaving a swampy center at the surface. Terrestrial plants take over and begin to slowly dry out the damp surface.
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