All of the following are benefits of organic farming and crop rotation as a sustainable agriculture method EXCEPT
A. it typically requires less water.
B. it requires the use of few or no pesticides.
C. it can best help large-scale farmers.
D. it can spread out the risk of crop failure.
Answer: C
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Some biodiversity experts advise us to focus our efforts on
a. slowing high rates of extinction in biodiversity hotspots b. slowing extinction in temperature deciduous forests c. saving single important species d. saving the polar bear which is the most endangered of all creatures e. saving fish populations because of their importance as a food source for humans
In order for a hurricane to form, how deep must the surface layer of warm ocean water extend to?
A. 40 metres B. 200 metres C. 20 metres D. 400 metres
All of the following could be considered proxy data for measuring global warming EXCEPT
A. sea surface temperature. B. tree rings. C. ice cores.
If current growth projections are accurate, the human population of the planet in 2050 will be about
A) 8 billion. B) 20 billion. C) 15 billion. D) 9 billion.