Answer:
I think it's A.
Explanation:
It contains significant amounts of valuable metals such as mercury, cadmium, and lead that can be harvested and sold.
They time how long each can hold it up above their heads for, then compare the times. The longest time has the most endurance.
Would it be a? Let me know:) hope This helps some !
Heavy industry, manufacturing and agriculture are three of the major causes of pollution of the Great Lakes system. The production of persistent organic pollutants (POPs) such as PCBs, DDT and dioxins, had previously been of principal concern. This does not account for all of the pollution, but are a majority of the blame. Chemical pollution, Plastic pollution, and Nutrient pollution have been devastating to The Great Lakes.
The causes of freshwater pollution are varied and include industrial wastes, sewage disposal, runoff from farmland, cities, and factory effluents, and the build-up of sediment. Emissions from factories and vehicles are released into the air.
Therefore, answers should be:
Industrial waste, sewage disposal and, runoff.
