Pathogens and waterborne diseases enter drinking water supplies from ________
A) pesticides entering groundwater
B) oil and chemical spills
C) poorly treated wastewater or from animal wastes from feed lots
D) excess nitrogen and phosphorus as agricultural runoff
E) upwelling
C
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When Earth's continents were assembled as Pangaea, they covered much of Earth's surface that lies near the equator. Why did this warm the Earth's climate?
A) It restricted the flow of surface currents. B) The Sun's most intense radiation struck land instead of water. C) both of the above D) neither of the above
An organism's ________ for many environmental factors determines where it can live
A) range of tolerance B) fitness C) carrying capacity D) adaptations E) survivorship
Why would a rural resident of a country in Sub-Saharan Africa move to a city slum?
What will be an ideal response?
Which horizon is the most valuable for agriculture?
a. A horizon b. E horizon c. B horizon d. R horizon