check out this Human Chimpanzee question from MGMAT

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The ability to analyze genomes — sequences of DNA — has grown more and more sophisticated. Scientists are able to examine the biological past in finer detail and with greater accuracy. A new analysis of the genetic links between early humans and chimpanzees has led to a hypothesis that the two species diverged more recently than previous estimates indicated. This gives credence to a very startling new theory: the ancestors of humans and chimpanzees might have hybridized to produce the lineage from which modern humans eventually developed.

What can be inferred from the statements above?

A) Hybridized species combine the best of both lineages.
B) Political and religious pressures will affect the course of future research.
C) Future research will enable scientists to determine the exact characteristics of this hybrid ancestor of modern man.
D) Earlier genome analysis established genetic links between early humans and chimpanzees.
E) Human DNA is more complex than that of chimpanzees.

The OA is [spoiler] C. This was what I initially thought but I got tripped up the the word "established" because I thought that it conveyed too strong of a connection- like having proven something. I thought E would be good because if humans are a mixed between early homo sapian and chimps, wouldnt human dna be more complicated? [/spoiler]
Source: — Sentence Correction |

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i'll assume that you meant to type (d), not (c), because your entire explanation deals with (d) and not with (c).
I got tripped up the the word "established" because I thought that it conveyed too strong of a connection- like having proven something.
you are correct that it conveys this sort of "strong connection".

however, this strong connection IS supported by the information in the passage. specifically, the passage contains the following words:
A new analysis of the genetic links between early humans and chimpanzees has led to a hypothesis that

if the passage contains these words, then the INFERENCE is that there absolutely must BE "genetic links between early humans and chimpanzees". this is 100% guaranteed if the premises in the passage are to be true and meaningful.

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I thought E would be good because if humans are a mixed between early homo sapian and chimps, wouldnt human dna be more complicated?
not necessarily. you're making EXTRA ASSUMPTIONS here. you can NEVER pick a choice that makes extra assumptions.

specifically, you're making the extra assumption that the DNA of a mixed species must be MORE complicated than the DNA of either of the two original species.
there's no good reason to assume this. for instance, you could just as well assume that the hybrid species would have DNA with a level of complexity intermediate between those of the 2 original species.
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by nervesofsteel » Thu Jul 09, 2009 1:48 am
only D is relevant to discussion .
remaining choices are too strong or completely vague .

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