Pesticide resistance occurs when a population of pests
A. Is not affected by chemicals because the pesticide chemicals do not break down in the environment
B. Genetically changes (through natural selection) and is no longer affected by the chemicals
C. Grows extremely large because of chemical misapplications
D. Is completely wiped out by the pesticide chemicals
E. Becomes too numerous for chemicals to control
Answer: B
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The ocean current called the Gulf Stream
A. travels through all of the world's oceans. B. vertically mixes the Atlantic ocean near the Southern United States. C. carries heat from the Gulf of Mexico to the North American coast and Northern Europe. D. carries heat from Hawaii to the Western coast of North America.
A major population challenge in Japan is
A. large numbers of children B. an unbalanced sex ratio C. an aging population D. massive emigration
What happens when dissolution occurs between halite and water?
A) Halite crystals break into sodium and calcium ions, which exist invisibly between water molecules. B) Halite crystals disappear and only water molecules end up being present. C) Water molecules break into hydrogen and oxygen ions, which exist invisibly between halite crystals. D) Water molecules disappear and only halite crystals end up being present.
Factors that do NOT affect the appearance of a shoreline from the water side include
A. orientation of the coastline B. slope of the seafloor C. strength of waves and tides. D. size and intensity of storms. E. All of these affect the appearance.