Why is the crude death rate lower in Latin America than it is in Sub-Saharan Africa?
A) Latin American communities have better access to modern medicine.
B) Communities in Sub-Saharan Africa have not undergone a Neolithic revolution.
C) Fertility rates are higher in Latin American communities.
D) Sub-Saharan communities are generally more urban than communities in Latin America.
A
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Symbiosis is defined as ________.
A. the relationship between herbivores and the algae that they graze upon B. the grouping of organisms according to their ability to cope with exposure and water loss C. a relationship between animals living on a mud flat and their environment D. a close intimate relationship between two dissimilar organisms E. None of these is correct.
Every winter morning when the sun is shining bright, a man living in Montana pulls back the drapes on a large, south-facing window. In this way, he helps heat his home using ________
A) radioactive solar heating B) active solar heating C) passive solar heating D) conductive solar heating E) photovoltaic heating
The top of the Earth's atmosphere is approximately
A) 3,200 km (1,988 mi) above the Earth's surface. B) 480 km (300 mi) above the Earth's surface. C) 2,000 km (1,243 mi) above the Earth's surface. D) 1,000 km (621 mi) above the Earth's surface.
At a warm front, the warm air
a. ?rises and cools. b. ?rises and warms. c. ?sinks and cools. d. ?sinks and warms. e. ?does not move.