Why are harmful algal blooms, or HABs, so dangerous?
A) They block light from reaching other photosynthesizers.
B) They can produce potent toxins.
C) They clog fish gills.
D) They absorb sunlight, raising the water temperature.
B
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Which of the following is one of the major pollutants of groundwater?
A) agricultural chemicals B) radon C) acid rain D) treated sewage from cities E) pathogenic microbes
Brazil's ________ was the major destination for Portuguese slave ships
A) Northeast B) West C) East D) Central region E) South
Demand to use congested roads has been reduced in a number of ways including
A) reduced car sales. B) prohibition of SUVs in congested areas. C) congestion charges and tolls. D) higher taxes for multi-car families. E) forced distancing parking for cars with low mileage efficiency.