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All intelligent life is multi-cellular, and multi-cellular life

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All intelligent life is multi-cellular, and multi-cellular life [#permalink]

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New post 08 Jan 2018, 06:38
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All intelligent life is multi-cellular, and multi-cellular life is only possible if the cells have the capability of producing energy. The cells in present day humans, animals, and plants, examples of complex cellular life, require oxygen to break nutrients down and create energy. Since the earth’s environment consisted almost entirely of carbon dioxide prior to the Wiwaxia event, there is little chance that any intelligent life existed on earth prior to the Wiwaxia event.

Which of the following is required to draw the conclusion in the above argument?
A) Recently discovered evidence suggests that there may have been breathable air on the earth several millennia before the Wiwaxia event.
B) The cellular life that existed before the Wiwaxia event had little ability to process atmospheric carbon dioxide, extracting oxygen from the same.
C) After the Wiwaxia event, the carbon dioxide in the earth’s atmosphere decreased by the same amount that the oxygen in the atmosphere increased.
D) Multi-cellular organisms require more energy than single-celled organisms.
E) Disruptions such as the Wiwaxia event have been observed on other planets that are believed to be capable of supporting life.
[Reveal] Spoiler: OA

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Re: All intelligent life is multi-cellular, and multi-cellular life [#permalink]

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New post 08 Jan 2018, 07:01
mandeey wrote:
All intelligent life is multi-cellular, and multi-cellular life is only possible if the cells have the capability of producing energy. The cells in present day humans, animals, and plants, examples of complex cellular life, require oxygen to break nutrients down and create energy. Since the earth’s environment consisted almost entirely of carbon dioxide prior to the Wiwaxia event, there is little chance that any intelligent life existed on earth prior to the Wiwaxia event.

Which of the following is required to draw the conclusion in the above argument?
A) Recently discovered evidence suggests that there may have been breathable air on the earth several millennia before the Wiwaxia event.
B) The cellular life that existed before the Wiwaxia event had little ability to process atmospheric carbon dioxide, extracting oxygen from the same.
C) After the Wiwaxia event, the carbon dioxide in the earth’s atmosphere decreased by the same amount that the oxygen in the atmosphere increased.
D) Multi-cellular organisms require more energy than single-celled organisms.
E) Disruptions such as the Wiwaxia event have been observed on other planets that are believed to be capable of supporting life.


B is the correct answer.

A) Recently discovered evidence suggests that there may have been breathable air on the earth several millennia before the Wiwaxia event.
--- "May" says that if we negate this option, it becomes "may not", which still has the slightest possiblity that life was supported before W event, and so doesn't hurts the concl.

B) The cellular life that existed before the Wiwaxia event had little ability to process atmospheric carbon dioxide, extracting oxygen from the same.
---Correct. If negated, it says W event had no ability to process carbon dioxide,extracting oxygen from the same. Which means,, no life forms existed before W event. So it hurts the concl badly.

C) After the Wiwaxia event, the carbon dioxide in the earth’s atmosphere decreased by the same amount that the oxygen in the atmosphere increased.
---ok, so what ? we are concerned about the stuff before W event, not after that.

D) Multi-cellular organisms require more energy than single-celled organisms.
---so what? it doesn't impact the conclusion.

E) Disruptions such as the Wiwaxia event have been observed on other planets that are believed to be capable of supporting life
---other planets are out of scope


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Re: All intelligent life is multi-cellular, and multi-cellular life   [#permalink] 08 Jan 2018, 07:01
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All intelligent life is multi-cellular, and multi-cellular life

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