Air pollution is

A. concentrated near the equator.
B. more common in economically developed countries.
C. low in economically less developed countries.
D. caused by the actions of people.


Answer: D

Environmental & Atmospheric Sciences

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A myelinated nerve fiber is ________, whereas an unmyelinated nerve fiber is ________.

Fill in the blank(s) with the appropriate word(s).

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The upper part of a thunderstorm cloud is normally ____ charged, and the middle and lower parts are ____

a. negatively; neutral b. negatively; positive c. positively; positive d. positively; negative e. positively; neutral

Environmental & Atmospheric Sciences

Human carrying capacity made its initial increase in Europe during the Mesolithic time period because of ________.

A. decreased population due to disease B. more gathering of wild fruits and berries C. more emphasis upon food cultivation D. increased hunting of wild animals

Environmental & Atmospheric Sciences

What traps light energy in primary producers?

a. Photosynthetic b. Thylakoid c. Chlorophyll d. Biomass

Environmental & Atmospheric Sciences