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  • which one of the following is NOT an indicator of high le...
Multiple choice

which one of the following is NOT an indicator of high levels of dissolved oxygen

  1. perch

  2. mayfly larva

  3. caddisfly larva

  4. leach

Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Leeches are highly tolerant of low-oxygen conditions and pollution. Perch, mayfly larvae, and caddisfly larvae are sensitive species that require high levels of dissolved oxygen.

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