?Match the term with the most appropriate description.

A. ?the ability of an ecosystem to survive moderate disturbances
B. gradual establishment of communities after a wild fire
C. the ability of an ecosystem to be restored
D. gradual establishment of communities of species in lifeless areas


A. ?persistence
B. ?secondary succession
C. ?resilience
D. ?primary succession

Environmental & Atmospheric Sciences

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Compressions and rarefactions of a longitudinal wave travel in

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Which of the following is true of the atoms in the backbone unit of a protein?

A) They all are in a straight line. B) They are all in the same plane. C) They all have tetrahedral geometry. D) None of these is correct.

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What designations are used to distinguish between the two forms of an allosteric enzyme?

A) a and b B) D and L C) R and S D) R and T

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Rainwater is naturally slightly acidic. Which gas causes this?

A) N2 B) O2 C) CO2 D) SO2

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