Briefly describe what is meant by the term pioneer species. Identify the general characteristics of pioneer species, and give an examples of pioneer species
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Pioneer species are among the first to colonize a new substrate after a severe disturbance that creates the conditions for primary succession. Pioneer plant species usually have airborne dispersal mechanisms such as windblown seeds or spores. Pioneer species such as lichens begin the process of soil formation, paving the way for other vegetation and eventually animals to establish.
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What property of half-lives makes radioactive material so problematic?
A. There is no known way to shorten a half-life. B. Radioactivity is limited by the natural decay time to stable isotopes. C. There is no known way to measure half-lives with any accuracy. D. All half-lives are long. E. both A and B
Is silver iodide used as a cloud seeding agent in warm or cold clouds? Why?
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The intertropical convergence zone coincides with Earth's meteorological equator which is different
than the 0? latitude line. Indicate whether the statement is true or false.
What percentage of all antibiotics used in the United States are added to animal feed?
A. 20% B. 40% C. 50% D. 60% E. 80%