Environmental Science
High biological oxygen demand indicates:

all of these
moderate microbial pollution
intense level of microbial pollution
absence of microbial pollution

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Environmental Science
Lead poisoning

reduces O2 carrying capacity of myoglobin in muscles
reduces O2 carrying capacity of hemoglobin in blood
increases O2 carrying capacity of hemoglobin in blood
increases O2 carrying capacity of myoglobin in muscles

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Environmental Science
During the winter solstice in the Northern Hemisphere:

At middle latitudes in the Northern Hemisphere, this marks the longest night of the year
The noon sun is overhead at 23.5o S latitude
All of these
Astronomical winter begins in the Northern Hemisphere

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