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Mature white pines intercept almost all the sunlight that

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Manager
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Mature white pines intercept almost all the sunlight that [#permalink] New post 26 Jun 2008, 23:18
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Mature white pines intercept almost all the sunlight that shines on them. They leave a deep litter that dries readily and they grow to prodigious height so that, even when there are large gaps in a stand of such trees, little light reaches the forest floor. For this reason white pines cannot regenerate in their own shade. Thus, when in a dense forest a stand of trees consists of nothing but mature white pines, it is a fair bet that:
Which one of the following most logically concludes the argument?

A) the ages of the trees in the stand do not differ from each other by much more than the length of time it takes a white pine to grow to maturity

B) the land on which the stand is now growing had been cleared of all trees at the time when the first of the white pines started growing

C) competition among the trees in the stand for sunlight will soon result in some trees' dying and the stand thus becoming thinner

D) other species of trees will soon begin to colonize the stand, eventually replacing all of the white pines

E) any differences in the heights of the trees in the stand are attributable solely to differences in the ages of the trees
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Re: CR - White Pines (source: 800) [#permalink] New post 27 Jun 2008, 12:42
Mature white pines intercept almost all the sunlight that shines on them. They leave a deep litter that dries readily and they grow to prodigious height so that, even when there are large gaps in a stand of such trees, little light reaches the forest floor. For this reason white pines cannot regenerate in their own shade. Thus, when in a dense forest a stand of trees consists of nothing but mature white pines, it is a fair bet that:
Which one of the following most logically concludes the argument?

A) the ages of the trees in the stand do not differ from each other by much more than the length of time it takes a white pine to grow to maturity

A
For this reason white pines cannot regenerate in their own shade
>>they had be planted around the same time
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Re: CR - White Pines (source: 800) [#permalink] New post 27 Jun 2008, 13:35
i agree with A. Baby trees can't grow.
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Re: CR - White Pines (source: 800) [#permalink] New post 28 Jun 2008, 18:36
maratikus wrote:
i agree with A. Baby trees can't grow.


OA is A. Thanks!
Re: CR - White Pines (source: 800)   [#permalink] 28 Jun 2008, 18:36
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