If the resilience of a damaged ecosystem is low enough, the degraded area may not be restored by secondary succession. When this happens, the damaged ecosystem has reached ____.
A. stability
B. inertia
C. constancy
D. a tipping point
E. resilience
Answer: D
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On March 21, the sun will be directly overhead at
A) A.
B) B.
C) C.
D) D.
The Russian region that is rich in resources and was the destination of many Russian people during Soviet times so that the local ethnic groups were outnumbered is
A. North Caucasus B. North European and Middle Volga C. Siberia and the Far East D. Territories of the Far North
One evolutionary trend in ungulates was ____________________, a change in tooth structure designed to provide a
continuous row of grinding teeth. Fill in the blank(s) with the appropriate word(s).
Water molecules can attach their positive sides against clay minerals because clay surfaces are also positively charged.
Answer the following statement true (T) or false (F)