A chemical leaks into a pond that selectively kills off the phytoplankton (a producer). Many of the other organisms in the pond die over a short period of weeks, and the overall species diversity declines. The phytoplankton in this pond could be considered a good example of ________________.

Question

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Phytoplankton are a keystone species because they play a crucial role in maintaining the structure of the ecosystem by being a primary producer and supporting the food web. Their removal leads to significant changes in the ecosystem, as seen by the decline in species diversity.

A Chemical Leaks into a Pond That Selectively Kills Off