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5
|
High productive crop strains and modern agriculture techniques to increase yields of food crops
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6
|
Our ancestors obtained food by _____
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7
|
When these formed, people developed government, laws and writing
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8
|
Practice of farming, raising animals, and provides dependable supplies of food produced in large quantity and stored for later use.
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10
|
It boosts plant growth
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13
|
Most energy comes from ______
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15
|
farming strategy in which large fields are planted with a single crop, year after year
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16
|
First humans in North America caused this of some animals because of excessive hunting
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17
|
Human activities can change local and global _____
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1
|
It can harm plant and animal populations and life-support systems
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2
|
Farmers acquired them, making it easier to farm
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3
|
Not having enough water and contaminating water can be a ____ for the future
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4
|
Time period when machines and factories increased in number and used more often
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9
|
Hunting, gathering, agriculture, industry, and urban development affect ____
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11
|
____ goods and services - processes that provide us with storage and recycling of nutrients
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12
|
As urban centers grew, people moved here
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14
|
Machinery helped farmers increase ____
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18
|
____ share a limited resource base and depend on it for a long-term survival
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