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Scientist: An orbiting spacecraft detected a short-term spike in sulfur dioxide in Venus’s atmosphere. █████████ ███ █████ ██ █████ ██████ ███████ ██████ ██ █████████ ███████████ ███ █████ ███ ████████ ██ █████████ ████ ████ █████ ██ ████ ████████ █████████ ███ ██ ██████ ███ ████████ ████ ████████ ████████ ██████ ███ █████ ██ ██████ ██ ██████ █████████ ████ ████ ██████████ ██ ██████ ███ █████████ ███████████ ███ █████ ██ ███████ ████ ████████ ██████████ ██ ████████ ████████████
Summarize Argument: Phenomenon-Hypothesis
The author concludes that we should not conclude that volcanic activity caused the short-term spike in sulfur dioxide on Venus. This is based on the fact that no active volcanoes have been identified on Venus, and planetary atmospheres are known to undergo cyclical variations in chemical composition.
Notable Assumptions
The author assumes that inactive volcanoes could not have produced a short-term spike in sulfur dioxide on Venus. The author also assumes that there aren’t any active volcanoes that we haven’t identified on Venus that could have produced the spike. Another assumption is that the cyclical variations in chemical composition could have accounted for the spike in sulfur dioxide.
16.
Which one of the following, ██ █████ ████ ███████ ███ ███████████ █████████
a
Conditions on Venus ████ ██ ████████ ████ ███ ██████████ █████████ █████ █████ ██████ █ ████████ ████████ █████████
b
Evidence suggests that █████ ███ █ ██████████ █████ ██ ██████ ███████ ██ ███████ ██████████ ██ █████ ████████
c
Levels of sulfur ███████ ████ ████ ██████ ██ ███████ ██████████ ████ ██ ███████ ██████████ ████ ███ ████ █████
d
Traces of the ██████ ███████ ████ ████████ █████████ ██ █████ ███ ██████████ ██ ███ ██████████ █████ █████ ███ █████████ ████ ██████
e
Most instances of ██████ ███████ ██████ ██ ███ ███████ ██████████ ███ ██████ ██ ███ ███████ ██ ██████ ██████