Which substance in refrigerants is most responsible for atmospheric ozone depletion?
A) Chlorine
B) Carbon
C) Fluorine
D) Hydrogen
Answer: A
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Provide definitions for the following terms: valve seats, valve port, valve margin, and valve stem.
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Name one strategy that plants could use when adapting to the following growing conditions:
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Which of these should NOT be included on a resume?
A) Your age B) A P.O. box address C) Your nickname D) None of these should be included.
Two-dimensional Poisson process. The number of plants of a certain species in a certain forest has a Poisson distribution with mean 10 plants per acre. The number of plants in T acres therefore has a Poisson distribution with mean 10T.
a. What is the probability that there will be exactly 18 plants in a two-acre region?
b. What is the probability that there will be exactly 12 plants in a circle with radius 100 ft? (1 acre = 43,560 
.)
c. The number of plants of a different type follows a Poisson distribution with mean ? plants per acre, where ? is unknown. A total of 5 plants are counted in a 0.1 acre area. Estimate ?. and find the uncertainty in the estimate.