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# As air-breathing mammals, whales must once have lived on

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Senior Manager
Joined: 02 Dec 2007
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As air-breathing mammals, whales must once have lived on [#permalink]

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01 Aug 2009, 09:01
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As air-breathing mammals, whales must once have lived on land and needed hind limbs capable of supporting the mammals weight. Whales have the bare remnants of a pelvis. If animals have a pelvis, we expect them to have hind limbs. A newly discovered fossilized whale skeleton has very fragile hind limbs that could not have supported the animals weight on land. This skeleton had a partial pelvis.
If the statements above are true, which one of the following, if also true, would most strongly support the conclusion that the fragile hind limbs are remnants of limbs that land-dwelling whales once had?

A. Whale bones older than the fossilized hind limbs confirm that ancient whales had full pelvises.

B. No skeletons of ancient whales with intact hind limbs capable of supporting the mammals weight have ever been found.

C. Scientists are uncertain whether the apparently nonfunctioning limbs of other early mammals derived from once-functioning limbs of their ancestors.

D. Other large-bodied mammals like seals and sea lions maneuver on beaches and rocky coasts without fully functioning hind limbs.

E. Some smaller sea-dwelling mammals, such as modern dolphins, have no visible indications of hind limbs.

OA
[Reveal] Spoiler:
A

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Manager
Joined: 10 Jul 2009
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02 Aug 2009, 09:09
"If animals have a pelvis, we expect them to have hind limbs" states that if animals have pelvis then they will certainly have hindlimbs.

"Whale bones older than the fossilized hind limbs confirm that ancient whales had full pelvises" - Since fossils confirm full pelvises so hind limbs are also confirmed.
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Joined: 01 Jul 2009
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Concentration: Entrepreneurship, Strategy
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02 Aug 2009, 09:31
A it is
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Senior Manager
Joined: 26 May 2009
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03 Aug 2009, 20:11
what is the source ? I took sometime but could finally nail down to A.

If animals have a pelvis, we expect them to have hind limbs
Senior Manager
Joined: 26 Jul 2009
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03 Aug 2009, 20:49
Ans is A. The remaining options are inconclusive.
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04 Aug 2009, 17:10
yeah Answer is A...in the passage it mentioned that if an animal has pelvis then it most likely has limps.
Intern
Joined: 15 May 2007
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07 Aug 2009, 04:28
A it is

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Re: CR :whale   [#permalink] 07 Aug 2009, 04:28
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# As air-breathing mammals, whales must once have lived on

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