In the Public Lands Survey System, one section equals ____
a. 36 square miles
b. 6 square kilometers
c. 640 acres
d. 120 hectares
c
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Which statement least characterizes laboratory research?
a. It allows measurement of model ecosystems and populations under controlled conditions. b. It is faster than similar field research. c. It is less costly than similar field research. d. It has been used to develop most of our knowledge about ecosystems. e. It has supplemented field research since the 1960's.
Which of the following best matches the description?Class of pesticides that interferes with normal nerve impulses.
A. biocide B. soft pesticide C. persistent pesticide D. hard pesticide E. organophosphate F. biomagnification G. micronutrients H. chlorinated hydrocarbon I. micronutrient J. pheromone K. macronutrient L. rodenticide M. herbicide N. weed O. auxin P. macronutrients Q. fungicide
The most abundant gases in Earth's present day atmosphere (by volume) are ____
A) carbon dioxide and nitrogen B) oxygen and water vapor C) nitrogen and oxygen D) oxygen and helium
Winds at the 500-mb level tend to steer surface systems in the same direction that the winds are moving
a. True b. False