Answer:
Most of the world's major cities were built on or around areas of freshwater. Our ancestors chose to settle near these areas as rivers were a means of supplying drinking water for their families and beasts, as a food supply, used for irrigating crops and as a means of transport in order to aid commerce.
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The researcher in the research is most likely studying human-environment interaction and all of its consequences on the locale.
Answer:
a) calculating the concentration at which 50% of the test organisms of a particular species die
Explanation:
Bioassays -
<u>Bioassays is an analytical method to assess the effect of marine pollutant on the organism by estimating the concentration at which 50% of the test organisms die after exposing the test organisms for a specified time.</u>
It can be done by quantitative or by qualitative experiment , or direct or indirect .
It is used to detect the biological hazards or give the quality assessment of the mixture .
It is also used for the monitoring the quality of water .
