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Updated on: 22 Mar 2023, 07:56
Originally posted by freedom128 on 04 Sep 2019, 17:39.
Last edited by Bunuel on 22 Mar 2023, 07:56, edited 4 times in total.
Last edited by Bunuel on 22 Mar 2023, 07:56, edited 4 times in total.
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The most reliable method to detect the presence of life on a planet would be by determining whether or not its atmosphere contains methane. This is because methane completely disappears from a planet's atmosphere through various chemical reactions unless it is constantly replenished by the biological processes of living beings.
Which one of the following statements, if true, most seriously weakens the argument?
A. There are other ways of detecting the presence of life on a planet.
B. Not all living beings have the ability to biologically produce methane
C. We are incapable at present of analyzing a planet's atmosphere for the presence of methane.
D. Some living beings biologically produce only very small amounts of methane
E. Earth is the only known planet whose atmosphere is known to contain methane
Which one of the following statements, if true, most seriously weakens the argument?
A. There are other ways of detecting the presence of life on a planet.
B. Not all living beings have the ability to biologically produce methane
C. We are incapable at present of analyzing a planet's atmosphere for the presence of methane.
D. Some living beings biologically produce only very small amounts of methane
E. Earth is the only known planet whose atmosphere is known to contain methane
04 Sep 2019, 21:30
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Conclusion: living beings produce methane gas, so finding methane in atmosphere is proof that life exists
Argument B states that not all living being produced methane, thus it is directly targeting the conclusion and weakening it as there may be life forms which do not produce methane biologically and would be present.
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Argument B states that not all living being produced methane, thus it is directly targeting the conclusion and weakening it as there may be life forms which do not produce methane biologically and would be present.
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22 Mar 2023, 07:15
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Can someone explain why option D is incorrect? If they produce very small amounts of methane then the atmosphere will not have much effect
