Critical Reasoning

@VeritasPrepDavid, Long time back you posted guidelines for practicing for the GMAT from LSAT papers. You also advised on attempting only the first 18 or so questions as the quests increased in complexity . Below are some questions all of which i got wrong . I am having a real bad night . Could You u please advise as to what number could these questions correspond to on the LSAT Official Paper.I googled and found these quests to be from LSAT Paper # 45 # 47
There is evidence to suggest that our cave-dwelling
ancestors polished many of their flints to a degree far
surpassing what was necessary for hunting purposes. It
seems, therefore, that early humans possessed an
aesthetic sense.
Which one of the following statements, if true, most
seriously weakens the argument?
(A) Most flints used by our cave-dwelling ancestors
were not highly polished.
(B) The caves in which the highly polished flints
were found are unadorned by cave paintings.
(C) There is evidence that these highly polished
flints were used for display in religious
ceremonies.
(D) Flints were often used by early humans for
everyday chores other than hunting.
(E) Any benefits that an aesthetic sense would have
given to cave-dwelling humans are poorly
understood.

Although the geological record contains some hints of
major meteor impacts preceding mass extinctions, there
were many extinctions that did not follow any known
major meteor impacts. Likewise, there are many
records of major meteor impacts that do not seem to
have been followed by mass extinctions. Thus the
geological record suggests that there is no consistent
causal link between major meteor impacts and mass
extinctions.

Which one of the following assumptions enables the
argument's conclusion to be properly inferred?

(A) If there were a consistent causal link between
major meteor impacts and mass extinctions,
then all major meteor impacts would be
followed by mass extinctions.
(B) Major meteor impacts and mass extinctions
cannot be consistently causally linked unless
many mass extinctions have followed major
meteor impacts.
(C) Of the mass extinctions that did not follow any
known major meteor impacts, few if any
followed major meteor impacts of which the
geological record contains no hints.
(D) If there is no consistent causal link between
major meteor impacts and mass extinctions,
then not all mass extinctions could have
followed major meteor impacts.
(E) There could be a consistent causal link between
major meteor impacts and mass extinctions
even if not every major meteor impact has
been followed by a mass extinction.

Reviewer: Many historians claim, in their own
treatment of subject matter, to be as little affected
as any natural scientist by moral or aesthetic
preconceptions. But we clearly cannot accept
these proclamations of objectivity, for it is easy
to find instances of false historical explanations
embodying the ideological and other prejudices
of their authors.

The reviewer's reasoning is most vulnerable to
criticism on the grounds that it

(A) takes for granted that the model of objectivity
offered by the natural sciences should apply in
other fields
(B) offers evidence that undermines rather than
supports the conclusion it reaches
(C) fails to recognize that many historians employ
methodologies that are intended to uncover and
compensate for prejudices
(D) takes for granted that some historical work that
embodies prejudices is written by historians
who purport to be objective
(E) fails to recognize that not all historical
explanations embodying ideologies are false