Which numbered layer represents the youngest layer?
A) 1
B) 2
C) 3
D) 4
D) 4
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Which of the following is a fish harvesting method used for harvesting schools of fish in shallow or surface waters, which has caused the death of large numbers of dolphins?
a. longlining b. purse-seine fishing c. trawler fishing d. drift-net fishing e. sport fishing
If grass stores 1,000 energy units received from the sun, the ecological efficiency of the ecosystem is 10%, and the trophic levels are grass ? cow ? human, how many units of energy does the human receive of the original 1,000 units?
A. 900 B. 200 C. 100 D. 10 E. 1
Glaciers are a single, solid piece of ice that flows from the Zone of Accumulation to the Zone of Saturation
Indicate whether this statement is true or false.
The Nature Conservancy, World Wildlife Fund, Greenpeace and the Grameen Bank are examples of non-governmental organizations working toward environmental conservation.
Answer the following statement true (T) or false (F)