Historically, the greatest threats to human health came from
A. Injuries (intentional and unintentional)
B. Pathogenic organisms
C. Psychological stress factors due to crowding
D. Carcinogenic or toxic chemicals
E. Teratogenic chemicals
Answer: B
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Where are deltas common?
a. Areas with high tidal range b. At high-energy shores of enclosed seas c. At convergent margins d. Areas with active waves and currents e. Near broad continental shelves
If a marine animal has body fluids that have a lower salt content than the surrounding seawater, water will pass through the animal's body tissues from the ________ to the ________ because of ________.
A. inside; outside; osmosis B. outside; inside; electrolysis C. inside; outside; electrolysis D. outside; inside; osmosis E. None of these is correct; the salt moves, not the water.
Which of the following characteristics is associated with all humid subtropical climates?
a. locations on the west coasts of continents in the middle latitudes b. pronounced winter maximum of precipitation c. warmest month at least 22?C d. a sufficiently durable snow cover to markedly affect winter temperatures
Explain why Earth is warmer at the equator than at the poles