From the point of view of radiation hazard, the radioisotopes of greatest concern are
A. inert gases because they escape into the atmosphere.
B. those of very long half-life (millions or billions of years).
C. those of very short half-life (minutes to days).
D. those of intermediate half-life (years to centuries).
Answer: D
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Judge the following sentence according to the criteria given below: It is advantageous for fishers to choose a population that feeds as close to the primary producing population as possible BECAUSE energy transfer between trophic levels is
inefficient. A) The assertion and the reason are both correct, and the reason is valid. B) The assertion and the reason are both correct, but the reason is invalid. C) The assertion is correct, but the reason is incorrect. D) The assertion is incorrect, but the reason is correct. E) Both the assertion and the reason are incorrect.
Which is one strategy for preparing for the projected harmful effects of moderate climate change?
A. Connect wildlife reserves with corridors. B. Move hazardous waste storage tanks closer to the coast. C. Develop crops that need more water. D. Encourage more construction in low-lying coastal areas.
Ignoring immigration, a developed country that has had a total fertility rate below 2 for several decades ________
A) probably has a declining dependency ratio B) will have a population declining in size C) has a decreasing average age D) All of these are correct.
The amount of useful work accomplished by a particular input of energy into a system is
a. Energy quality b. Energy potential c. Energy capacity d. Energy efficiency e. Energy loss