According to researchers, the greatest threat to wild species is ____.
A. habitat destruction
B. invasive species
C. population and resource use growth
D. pollution
E. climate change
Answer: A
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Which of the following best matches the description?Accumulation of potential acid-forming particles on a surface.
A. greenhouse effect B. ozone C. acid deposition D. primary air pollutants E. radon F. oxides of nitrogen G. photochemical smog H. particulates I. thermal inversion J. sulfur dioxide K. secondary air pollutants
Shake an object to and fro to best judge an object's
A. mass. B. weight. C. both the same D. none of the above
A map is usually much smaller than the part of the Earth's surface it represents
Indicate whether the statement is true or false.
Glacial advances in the past have been accompanied by increased CO2 levels
Indicate whether the statement is true or false