The lesson learned from the Czech Republic's White Carpathian grasslands is
A) restoration efforts are compatible with cattle ranching.
B) restoration of degraded grasslands by conservation and reseeding programs.
C) a limited introduction of non-native species can speed restoration.
D) plant species, not animal species, recover well in the restoration program.
B
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An ungloved fist will do more damage to a jaw than a gloved fist. The reason for this is that the ungloved fist
A) delivers a larger impulse to the jaw. B) exerts a larger force on the jaw. C) has less air resistance on it. D) none of the above
Thin, wispy clouds blown by high winds into long streamers, called mare's tails, are ____
A) stratus B) cirrocumulus C) altostratus D) cirrus
Which one of the following statements about the perception of environmental risk is correct?
A. The lay public ranks the risk of invasive species lower than environmental professionals. B. The lay public ranks the risk of hazardous waste sites lower than environmental professionals. C. The lay public ranks the risk of radiation lower than environmental professionals. D. The lay public ranks the risk of pollution by sewage lower than environmental professionals.
Biodiversity experts estimate that during this century, the extinction rate due to human activities will rise to ____ times the background extinction rate.
A. 3 B. 10 C. 20 D. 100 E. 10,000