The age of the oldest amphibian fossils is
a. Early Devonian. d. Early Silurian.
b. Late Silurian. e. Cambrian.
c. Late Devonian.
C
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Antarctica
A) is owned by the United Nations. B) has a small but thriving native population. C) is the coldest place in the Northern Hemisphere. D) has been carved like a territorial pie into claims by various states.
Smog, the product of NOX, sunlight, and ________, is created by chemical reactions that occur in the atmosphere
A) carbon monoxide B) sulfur oxides C) hydrocarbons D) particulates
Projections for mineral use, even with conservative estimates of consumption levels, suggest that present reserves of most metals/minerals could be exhausted within what time frame?
a. A few years b. A few decades c. A few centuries
At present, sea level is decreasing around the world's coasts.
Answer the following statement true (T) or false (F)