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Q: To determine the health of aquatic organisms, which of the following declaration is calculated?
  • A. Dissolved oxygen
  • B. Dissolved fluorine
  • C. Dissolved methane
  • D. Dissolved calcium
Correct Answer: Option A - Water temperature affects dissolved-oxygen concentrations in a river or water body. Dissolved oxygen in surface water is used by all forms of aquatic life; therefore, this constituent typically is measured to assess the health of lakes and streams.
A. Water temperature affects dissolved-oxygen concentrations in a river or water body. Dissolved oxygen in surface water is used by all forms of aquatic life; therefore, this constituent typically is measured to assess the health of lakes and streams.

Explanations:

Water temperature affects dissolved-oxygen concentrations in a river or water body. Dissolved oxygen in surface water is used by all forms of aquatic life; therefore, this constituent typically is measured to assess the health of lakes and streams.