Naturalist: A species can survive a change in environment, as long as the change is not too rapid. Therefore, the th...

Asnodgrass on September 6, 2014


Can you please explain why D is the right answer? Thank you!

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Naz on September 11, 2014

The passage tells us that a species can survive a change that occurs in its environment, as long as the change does not occur very quickly. It then concludes from this that the threats we pose to woodland species are not created from the fact that we are changing their environment, i.e. that we are cutting down the trees, but from how fast we are doing it.

So, if the change in environment is not too rapid, then the species will survive the change.

PR: not R ==> S
not S ==> R

Thus, the threats to woodland species is not from the environment changing.

P: not S

It is from the rate at which we are changing it.

C: R

Answer choice (D) states: "People do not fear change if they know what the change will bring; so, our employees' fear stems not from our company's undergoing change, but from our failing to inform them of what the changes entail."

This follows the same reasoning as the passage. We are presented with a principle rule: if they know what the change will bring, people do not fear change.

PR: K ==> not F
F ==> not K

So, the employees' fear does not stem from the company undergoing change.

P: F

Rather, it stems from their lack of knowledge as to what the changes will entail.

C: not K

As you can see, both the stimulus and answer choice (D) present us with principle rules and then invoke the contrapositive of those principle rules to make their conclusions.

Hope that was helpful! Please let us know if you have any other questions.