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The assumption that chlorofluorocarbons would be ____ in the environment because they were chemically inert, was challenged by the demonstration of a

potential threat to the ozone layer.

a) deleterious
b) innocuous
c) persistent
d) noxious
e) durable


Noxious is the correct anwer. Noxious means jarful or poisonous.
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The correct answer is  d) noxious
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