PrepTest 73, Section 3, Question 13
In early 2003, scientists detected methane in the atmosphere of Mars. Methane is a fragile compound that falls apart when hit by the ultraviolet radiation in sunlight. So any methane in the Martian atmosphere must have been released into the atmosphere relatively recently.
In early 2003, scientists detected methane in the atmosphere of Mars. Methane is a fragile compound that falls apart when hit by the ultraviolet radiation in sunlight. So any methane in the Martian atmosphere must have been released into the atmosphere relatively recently.
In early 2003, scientists detected methane in the atmosphere of Mars. Methane is a fragile compound that falls apart when hit by the ultraviolet radiation in sunlight. So any methane in the Martian atmosphere must have been released into the atmosphere relatively recently.
In early 2003, scientists detected methane in the atmosphere of Mars. Methane is a fragile compound that falls apart when hit by the ultraviolet radiation in sunlight. So any methane in the Martian atmosphere must have been released into the atmosphere relatively recently.
The argument relies on the assumption that
Mars had no methane in its atmosphere prior to 2003
all methane in the Martian atmosphere is eventually exposed to sunlight
methane cannot be detected until it has started to fall apart
the methane that the scientists detected had been exposed to ultraviolet radiation
methane in Earth's atmosphere does not fall apart as a result of exposure to ultraviolet radiation
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