There is evidence in this response that the student has a basic understanding of the question. The ecological roles of the two species are identified (algae produce and the snails consume). Ecological factors are listed (weather, seasons, and other consumers) that may affect population size. (If the weather is to harsh they die or if they are all consumed they all die.) The student also attempts to address how both populations would be affected by a landfill (snails would most likely die…not being able to move or breath; algae would probably stay the same). The supporting details are adequate.
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