Why is municipal wastewater sludge considered problematic?
A) it is too rich in nutrients
B) it sometimes contains heavy metals
C) it has no known use
D) it has a high biochemical oxygen demand
B
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What substances are being overused in feedlots causing a reduction in the effectiveness of antibiotics used in treating infections in humans?
What will be an ideal response?
Which of the following is a pure substance?
A. orange juice B. baking soda C. duct tape D. salt water E. cooking oil
I an oceanic plate-continental plate collision, denser continental crust dives beneath oceanic crust
Indicate whether the statement is true or false
Which of the following ecosystems accounts for 21.0% of the world marine fishery?
A) Coastal and coral systems B) Nontropical shelves C) Open ocean D) Tropical shelves E) Upwellings