Fundamental to insulators are
A. bound electrons.
B. free electrons.
C. both of these in various proportions
D. none of the above
Answer: A
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A pheromone is
a. a new form of chemical insecticide awaiting approval by FIFRA b. a strong herbicide c. a species-specific chemical sex attractant d. a bloodstream chemical that controls an organism's growth and development e. a safe, natural pesticide
A group behavior that is much more common in bony fish than cartilaginous fish is ________.
A. migration B. schooling C. homing D. territoriality
Oceanic ridges are geologically stable features where sediments are deposited and nothing much else takes place.
a. true b. false
Judge the following sentence according to the criteria given below: The true value of the ecological efficiency in populations important to present fisheries is of practical importance BECAUSE it determines the size of the fish harvest that can
safely be taken from the oceans without damaging the ecosystem. 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.