Discussion
In lake succession, the stages are observed in the following order :
Answer: A
Lake succession runs Oligotrophic-Mesotrophic-Eutrophic.
A young lake is usually deep, clear and poor in nutrients (oligotrophic). Over time it gains nutrients and sediment from its catchment, productivity rises through a mesotrophic stage, and it becomes shallow, nutrient-rich and highly productive (eutrophic), often with oxygen-poor bottom water. It may eventually fill in to marsh and land.
The other orders either reverse the trend, as in eutrophic to oligotrophic, or skip the intermediate stage, which does not fit the gradual enrichment that drives the sequence.
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