Skip to Main Content

Source: Official Guide for GMAT Review 2016 Critical Reasoning; #11


Which of the following, if true, most helps to

Which of the following, if true, most helps to explain the decline in the population of the fish species?

1 Explanation


John Robertson

Q: Why is there a decline in a fish species, despite a decrease in the population of its main predator, the alligator?

Important supporting info: there has not been an increase in the annual number of fish caught by humans to eat. Something else is happening

A: WRONG. Fishers may be working the waters more because less alligators, but the prompt says the number caught hasn't gone up. So human catching fish is not the cause for the fish declines.

B: WRONG. same reason as A.

C: Correct. The prompt pretty clearly leads you to read that humans aren't the cause of the fish declines, so something is at work. Less alligators (main predator), humans aren't catching more (another main predator), what is decreasing the fish? Leads you to think pollution, another predator of the fish that is also benefiting from less alligators, etc. This answer answers that theory well of "who/what other than humans and gators are declining the fishes"

D: WRONG. We know alligators are declining, irrelevant background information.

E: WRONG. same as D essentially

Jan 4, 2017 • Comment

Add Your Explanation

You must have a Magoosh account in order to leave an explanation.

Learn More About Magoosh

Official GMAT Material

Official Guide for GMAT Review 2016

Official Guide for the GMAT 13th Ed.

Official Guide for the GMAT 2015 14th Ed.

Nova's GRE Prep

Official Guide for the GMAT 12th Ed.

Revised GRE PDF 2nd Ed.

Section 8.4 Critical Reasoning

Improve Your Score

Magoosh GMAT is an affordable online course for studying the GMAT.

Learn More About Magoosh

Share Post