The first primitive organisms on Earth came into existence approximately ________ years ago
A) 10,000
B) 550 million
C) 3.8 billion
D) 4.6 billion
Answer: C
Environmental & Atmospheric Sciences
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A. Classical B. Neoclassical C. Political D. Ecological E. Social
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Which of the following are pioneer species on recently glaciated rock?
A) spruce and fir trees B) herbs and shrubs C) evergreens and fir trees D) maples and redwoods E) lichens and mosses
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How can algal growth be a problem in a freshwater system?
What will be an ideal response?
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The creation of which sedimentary feature is controlled in part by debris flows exiting a narrow canyon?
A) Fluvial B) Dunes C) Lacustrine D) Alluvial fan
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