In a pond ecosystem, DDT (dichlorodiphenyltrichloroethane) concentrations are measured as follows:Concentration of DDT in water: 0.002 ppm (parts per million), Concentration of DDT in plankton: 0.01 ppm, Concentration of DDT in small fish: 0.1 ppm. Assuming a biomagnification factor of 10, calculate the expected concentration of DDT in large fish in the pond.a.0.1 PPMb.0.001 PPMc.1.0 PPMd.10.0 PPM

In a freshwater lake ecosystem, there is a chain of organisms consisting of algae, zooplankton, small fish, and large predatory fish. The lake has been contaminated with a toxic substance that biomagnifies in the food chain. The concentration of the toxic substance in water is initially measured at 2 parts per million (ppm). Each trophic level accumulates 10% of the toxic substance from the previous level. Calculate the concentration (PPM) of the toxic substance in Large predatory fish.a.0.02b.0.002c.0.2d.0.0002

DDT was sprayed in a lake to regulate breeding of mosquitoes. How would it affect thetrophic levels in the following food chain associated with the lake? Justify your answer

If a sample of water contains an abundance of dragonfly nymphs and no stonefly nymphs, then the phosphate level of the water most likely falls within what range?

Pond water can contain many types of organisms. Which of the following are you most likely to find in a pond water sample?

A geochemist measures the concentration of salt dissolved in Lake Parsons and finds a concentration of 47.·gL−1. The geochemist also measures the concentration of salt in several nearby non-isolated lakes, and finds an average concentration of 5.89·gL−1.Assuming the salt concentration in Lake Parsons before it became isolated was equal to the average salt concentration in nearby non-isolated lakes, calculate the percentage of Lake Parsons which has evaporated since it became isolated.Round each of your answers to 2 significant digits.