About 150 years ago, self-sufficiency in the production of food no longer became restrictive to countries because of
A) the global decline in droughts, blights, or wars.
B) the Industrial Revolution.
C) the Green Revolution.
D) biotechnology.
B
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Describe and discuss mass extinctions during the Paleozoic and Mesozoic. How do these mass
extinctions differ? What will be an ideal response?
What is usually the highest point on a beach?
a. Backshore b. Berm crest c. Beach scarp d. Longshore bars
Irrigation can result in the salinization of soils because ________
A) irrigation is typically used in areas where windblown salts from sea spray can accumulate when the protective vegetation is removed B) the irrigation water washes away soil leaving behind concentrated salts C) many of the plants grown in these regions excrete salts into the soil D) salts are deposited on the soil surface as water evaporates E) shortages of fresh water require the use of saltwater for irrigation
What happens as ice melts in polar regions?
a. More heat is reflected into space. b. Glaciers re-freeze at night. c. Exposed surfaces absorb heat and make melting worse. d. Polar bears learn to like the sun.