To provide an accurate conclusion supported by the graph, we would need to analyze the specific data and trends represented in it. However, since I can't see the graph or the data it contains, I can guide you on how to approach the conclusion based on the answer choices given:
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Infection in embanked ponds increased during the sampling period: If the graph shows a rising trend in infection percentages over time in embanked ponds, this conclusion would be supported.
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Protozoans were more common in creek-fed ponds than embanked ponds: This would be supported if the graph shows consistently higher infection rates in creek-fed ponds compared to embanked ponds.
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Protozoans reproduce more quickly in embanked ponds than creek-fed ponds: This conclusion cannot be directly drawn from a graph showing infection rates without additional information on protozoan reproduction rates, so it is likely not supported.
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Infection in creek-fed ponds remained constant throughout the sampling period: If the graph shows a flat line for infection rates in creek-fed ponds, this conclusion would be supported.
To conclude, without seeing the actual trends in the graph, it’s impossible to determine which statement is supported. You would need to identify the observable trends in the graph to accurately choose the correct conclusion.