Effects of centuries of European overseas expansion on agriculture include all of the following EXCEPT
A) commercial agricultural systems have become a feature of much of the world.
B) hunting and gathering has virtually disappeared.
C) few completely self-sufficient farms exist.
D) subsistence farming has been completely eradicated.
E) All of the above are effects.
D
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The source of nitrogen in the nitrogen cycle is found in rocks.
Answer the following statement true (T) or false (F)
In the near future, the benefits of biofuel production may be enjoyed while reducing the impact on the global production of grain. One such promising approach is to ________
A) gasify coal to increase the efficiency of coal power plants B) use the large amounts of animal wastes to produce ethanol C) find ways to convert oil and natural gas into ethanol D) produce biofuels from grasses instead of corn E) bioengineer cattle and goats to produce ethanol in their milk
The mosaic-like stone surface forming the ground in a desert is called:
a. desert pavement b. desert pediment c. inselberg d. alluvium
Discuss the human lineage. What will be an ideal response?