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 .
Fertile farming land and and a lot of farmers use this land to day mostly for farming and to live on
The capital of Meghalaya, Shillong lies on the eastern part of the state. Perched at an altitude of 1,520 meters (4,990 feet) above sea level, the city stretches for about 6 km on an elevated tract.
C. when did the earth form? and what is it made of?
Between the 1870 and 1900
