Why are particulates considered such a significant health hazard?
A) They can cause respiratory problems.
B) Small amounts can be acutely toxic to humans and livestock.
C) They are emitted largely by natural sources.
D) They are concentrated in rural areas.
A
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Nitrogen:
A) is a variable gas. B) has a short residence time. C) is a relatively unstable gas. D) has little effect on climate.
Why is the International Building Code important for reducing mass wasting losses?
Specialized cells, tissues, and organs which secrete hormones are part of the
A. digestive system. B. endocrine system. C. excretory system. D. circulatory system. E. immune system.
The trapping of solar radiation in Earth's lower atmosphere
A) is entirely anthropogenic. B) is called the greenhouse effect. C) began with humans' use of fossil fuels. D) has no benefits. E) began with humans' use of fossil fuels and has no benefits.