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Additionally, a series of GM crops have modified to express traits like an efficient use of soil nitrogen, which directly increases agricultural yield while reducing the use of fertilizers, and the new generation of diverse drought-tolerant, heat-tolerant and salinity-tolerant crops, which will increase the final yield
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Answer: positive feedback loops enhance or amplify changes. this tends to move a system away from its equilibrium state and make it more unstable. Negative feedbacks tend to dampen or buffer changes. this tends to hold a system to some equilibrium state making it more stable.
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Answer:
 When water evaporates, the salt is left behind. The fresh water vapor that condenses into clouds, with many of which drift over land. 
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Yes, viruses are super small. It is also smaller than bacteria. So you wouldn't notice anything.