(Solved): 1. DDT is toxic to fish and aquatic invertebrates. Based on what you know about ecosystems and food ...

1. DDT is toxic to fish and aquatic invertebrates. Based on what you know about ecosystems and food chain dynamics, what are two potential impacts (include at least 2) to an aquatic ecosystem that receives a particularly high dose of DDT ( i.e., a much higher original concentration of DDT in the water)? 2 points 2. Half-life is the time required for half of an amount of a particular compound to degrade (see table below). The half-ife of DDT in the soil is from 2 to 15 years, and the halffife of DDT in an aquatic environment is 150 years. 6 points a. How many years have passed after five DDT half-ives in an aquatic environment? Show your calculation(s) b. If the original concentration of DDT in the water is \( 2 \mathrm{ppm} \), how much DDT would be remaining in the water after 1 half-life? Show your calculation(s) c. How much DDT would be remaining in the water after 5 half-lives? Show your calculation(s) d. If the half-life of DDT in soil A is 8 years and the original concentration of DDT in the soil is \( 10 \mathrm{ppm} \), how much DDT will be in the soil after 12 years? Show calculation(s). 3. Do you think DDT has the potential to cause more long-term harm to an estuary ecosystem or a terrestrial (on land) ecosystem? Why? 2 points 4. Using the Internet and/or the fext, list and explain 2 different consequences to human beings when they are exposed to pesticides over a long period of time (i.e. chronic exposure)? Cite your resources. 2 points