Support is growing for the idea that a late Precambrian ice sheet was so extensive that the surface of the world ocean was frozen.
Answer the following statement true (T) or false (F)
True
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What was the main requirement for the development of life on Earth?
a. Exposure to sunlight b. Absence of free oxygen c. Simple sugars d. Energization from electrical sparks
The cutting of large trees in a natural forest and subsequent sale of the logs for timber, is an example of
A) the consumptive use of a natural resource. B) the productive use of a natural resource. C) the minimum sustainable yield of a resource. D) the carrying capacity of a population.
Of the following, which is the most likely source for coarse particulate matter?
A) power generation B) residential fireplaces C) fossil fuel combustion in vehicles D) cars driving on unpaved roads
Which of the following is not a problem with generalizing the results of LD50 to humans?
A. Differences in metabolism can lead to different reactions. B. Differences in physiology and metabolism can lead to different reactions. C. Different individuals of the same species can have different reactions. D. Smaller species generally have reactions that are more sensitive. E. Closely related species can have different reactions.