Certain species of aquatic organisms are particularly sensitive to environmental changes. Scientists often monitor the behavior population size, and overall health of these so-called indicator species in order to evaluate the water quality in an ecosystem. Biological indicator species are important to water systems because
A. They can convert harmful pollutants into helpful nutrients in an ecosystem.
B. They provide an early warning sign of degrading water quality in an ecosystem.
C. They become healthier as water quality degrades and can replace weaker species.
D. They are used to control water quality by filtering out pollutants in an ecosystem
Answers: 2
Biology, 22.06.2019 01:50
Four different thermometers were used to measure the temperature of a sample of pure boiling water. the measurements are recorded in the table below. thermometer temperature reading 1 temperature reading 2 temperature reading 3 w 100.1°c 99.9°c 96.9°c x 100.4°c 102.3°c 101.4°c y 90.0°c 95.2°c 98.6°c z 90.8°c 90.6°c 90.7°c the actual boiling point of pure water is 100.0°c. what can be concluded from the data about the reliability and validity of the thermometers?
Answers: 1
Biology, 22.06.2019 03:00
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Biology, 22.06.2019 06:10
Which process of living things produces water that enters the water cycle
Answers: 1
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