Explain the benefits of using perennial plants rather than annual plants for food crops
What will be an ideal response
Annual plants such as the grain crops wheat, sorghum, and sunflowers, have to be replanted every year.
If perennial plants were used instead of annual plants, the soil would not have to be tilled every year for planting. This would reduce soil erosion and water pollution from eroded sediment because the unplowed soil would not be exposed to wind and rain. It also would reduce the need for irrigation because the deep roots of the annual plants retain more water than the shallow rooted annual plants. There is also less need for chemical fertilizers and pesticides for perennial plants.
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What Aristotle overlooked about motion, but was incorporated by Galileo, was the role of
A. time. B. distance. C. space. D. none of the above
Sometimes large rocks break up in Earth’s atmosphere and fall as a(n) _______________, spread out around the main impact site
Fill in the blank with correct word.
Breast-feeding children for long periods
A. Can be a successful population control strategy B. Limits fertility when caloric intake is low and can be a successful population control strategy C. Is a luxury that mainly wealthy women enjoy D. Increases fertility when caloric intake is low E. Is a luxury that mainly wealthy women enjoy and it also limits fertility when caloric intake is low
Most limestone is ________ mechanical surface weathering
A) resistant to B) prone to C) compatible with D) neutral to the effects of E) the cause of