The overlapping area between two major plant-dominated ecosystems is:
a. an ecotone where elements of both ecosystems intermingle
b. a corridor separating the two ecosystems
c. a patch with elements of both ecosystems
d. a region with negative ecological optimum
A
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Which policy is used in the U.S. with regard to the manufacture and sale of new chemicals?
A. Chemicals are assumed to be safe until substantial evidence to the contrary is proven. B. The chemical company must present overwhelming evidence that the chemical will do no harm. C. Chemicals are assumed to be dangerous until substantial evidence to the contrary is proven. D. Chemical manufacturers have enthusiastically supported laws that protect people over chemicals.
Part of the gill structure in jawless fish evolved into jaws. Indicate whether the statement is true or false
Falls, slumps, and slides may turn into flows
Indicate whether the statement is true or false
In the last two or three centuries birthrates ________.
A. have skyrocketed, while death rates have plunged B. and death rates remained flat C. and death rates have plunged D. have changed little, while death rates have plunged E. and death rates have skyrocketed