1. |
animals
02:27
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2. |
chlorofluorocarbons
01:21
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3. |
deforestation
02:01
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4. |
food chain
01:57
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5. |
greenhouse effect
01:27
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6. |
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7. |
mitigation
01:54
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8. |
natural selection
00:57
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9. |
optimum population
01:30
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10. |
pollution
02:05
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11. |
reforestation
03:22
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12. |
succession
02:24
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13. |
territoriality
01:51
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14. |
xeriscape
01:10
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15. |
zero emissions
00:32
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