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
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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
What traps light energy in primary producers?
a. Photosynthetic b. Thylakoid c. Chlorophyll d. Biomass
A myelinated nerve fiber is ________, whereas an unmyelinated nerve fiber is ________.
Fill in the blank(s) with the appropriate word(s).
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