Look at the chart below. We know that the water in Dwyer Lake is polluted because of the presence of sludgeworms. In this case, sludgeworms are a... what?
Question
Look at the chart below. We know that the water in Dwyer Lake is polluted because of the presence of sludgeworms. In this case, sludgeworms are a... what?
Solution
In this case, sludgeworms are an indicator species. Indicator species are organisms whose presence, absence or abundance reflects a specific environmental condition. Sludgeworms are known to thrive in polluted waters, so their presence in Dwyer Lake indicates that the water is polluted.
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