In using control by natural enemies of pests, from the ecological perspective it is best to
A) import enemies from abroad or from distant ecosystems to have the highest kill rate.
B) select enemies that have a very broad range of pest prey or hosts.
C) couple this method with intensive broad-spectrum pesticide spraying.
D) select enemies that are local and have a narrow specificity for the pest in question.
D
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Why is there such little waste in nature?
A. The sun is an inexhaustible resource. B. Organisms naturally avoid activities that create unnecessary waste. C. The wastes and decayed bodies of any organism become nutrients or raw materials for other organisms. D. The earth is so vast that natural waste is not easily identified. E. Waste is chemically unstable.
Which of the following causes the formation of large crystals such as pegmatite?
A) high fluid content of magma B) high heavy metal content of magma C) high silica content of magma D) high solidification factor of magma
________ systems are characterized by hot water circulation
Fill in the blank(s) with correct word
Which of these numbered features contains most of Earth's freshwater?
A. 1-ocean B. 2-atmosphere C. 3-glaciers and ice sheets D. 4-groundwater E. 5-lakes