In the 1990s, the new forest management strategy of the Forest Service shifted from
A) extracting resources to protecting the ecological health and diversity of forests.
B) protecting the ecological health and diversity of forests to extracting resources.
C) wilderness protection with no commercial logging to widespread commercial extraction.
D) widespread clear-cutting and reduction of total forested areas to a great expansion of forested land.
A
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When Ale pushes on a tree,
A. an interaction occurs between her and the tree. B. the tree pushes on Ale. C. Both pushes comprise a force pair. D. all of the above
The image below shows a beam of radiation passing between two electrically charged plates. 
Which of the beams is due to a positively charged helium nucleus?
A. a B. b C. c D. all of the above E. none of the above
Which of the following is most important to urban biodiversity and ecosystem services?
A) beaches B) greenhouses C) urban rooftops D) window-box gardening E) trees and forested parks
Why do lunar scientists think the surface of the moon was once a magma ocean?
A) Early lunar craters show a morphology suggesting impact with a liquid. B) The lunar highlands contain large amounts of the rock anorthosite, which is the light material that "floated" on the top of the magma ocean. C) The surface of the moon is entirely volcanic. D) None of these is correct.