BREAKING: Target Test Prep releases Brand New 2026 On Demand GMAT prep course

Redeem

Target Test Prep · GMAT

Choose how you want to prepare

Learn live with an expert or move at your own pace. Every option includes the complete TTP study system.

★★★★★5.0559 reviews
Vote for Target Test Prep, Newsweek Readers’ Choice Awards 2026
NEWSWEEK READERS’ CHOICE 2026

BIG NEWS! Target Test Prep has been nominated, and they’d love your vote!

TTP has worked incredibly hard to build the best test prep experience possible, and winning Newsweek’s 2026 Readers’ Choice Award for Best Test Prep would mean a lot to them. If TTP has helped you, they’d be incredibly grateful for your vote. You can vote once each day through September 9.

Vote for TTP
GMATLiveTeach 7 seats left
Chris Peckover
NEXT LIVE COHORT

Oct 13 to Jan 7, 2027

with Chris Peckover

Schedule
Tue, Thu · 8:00 to 10:00 PM ET
Included
40 live hours + 6 months of GMAT OnDemand
  • Live instruction and real-time questions
  • Class recordings and assigned practice
View class & enroll
Limited cohort · enrollment openTarget Test Prep
EALiveTeach 5 seats left
Logan Thompson
EXECUTIVE ASSESSMENT

Sep 6 to Dec 6, 2026

with Logan Thompson

Schedule
Sun · 9:30 AM to 12:30 PM ET
Included
40 hours of live online classes plus six months of access to the complete TTP EA OnDemand course.
  • 165+ EA Score Guarantee
  • 4,100+ Quant, Verbal, and Integrated Reasoning practice questions
  • 400+ hours of in-depth video lessons
  • 3,000+ step-by-step video solutions
View EA class & enroll
Limited cohort · enrollment openTarget Test Prep
GMATOnDemand Start anytime
SELF-PACED MASTERCLASS

Target Test Prep GMAT OnDemand

Complete access from day one. Study on your schedule.

715+ score guarantee
$0to start then $127/mo
  • Personalized study plan and analytics
  • Thousands of lessons and practice questions

Compare the format, schedule, and included access before enrolling. Prices and seat counts shown reflect the supplied offer details.

Loggerhead turtles

Expert replies
by ssgmatter » Thu Jul 08, 2010 7:30 am
Loggerhead turtles live and breed in distinct groups, of which some are in the Pacific Ocean and some are in the Atlantic. New evidence suggests that juvenile pacific loggerheads that feed near the Baja peninsula hatch in Japanese waters 10,000 kilometers away. Ninety-five percent of the DNA samples taken from the Baja turtles match those taken from turtles at the Japanese nesting sites.
Which one of the following, if true, most seriously weakens the reasoning above?
(A) Nesting sites of loggerhead turtles have been found off the Pacific coast of North America several thousand kilometers north of the Baja peninsula.
(B) The distance between nesting sites and feeding sites of Atlantic loggerhead turtles is less than 5,000 kilometers.
(C) Loggerhead hatchlings in Japanese waters have been declining in number for the last decade while the number of nesting sites near the Baja peninsula had remained constant.
(D) Ninety-five percent of the DNA samples taken from the Baja turtles match those taken from Atlantic loggerhead turtles.
(E) Commercial aquariums have been successfully breeding Atlantic loggerheads with Pacific loggerheads fro the last five years.
Best-
Amit
Join the discussion
Source: — Critical Reasoning |

by albatross86 » Thu Jul 08, 2010 7:43 am
Fact 1: Atlantic and Pacific loggerheads are two DISTINCT groups.
Fact 2: 95% of DNA samples from Baja & Japanese match

Conclusion: Fact 2 suggests that these turtles that feed in Baja actually hatched in Japanese waters.

WEAKENER

A. There are nesting sites north of Baja - this is irrelevant as it does not dispute the DNA evidence.

B. This talks about something completely different- Atlantic turtle nesting and feeding sites. Irrelevant.

C. An irrelevant statistic.

D. Booyah! 95% of the DNA samples also match the Atlantic turtles. Now we could then infer, by the same reasoning, that these turtles hatched in Atlantic waters, which contradicts both Fact 1 (which claims that the two are distinct) and the conclusion!

E. Aquariums have been breeding them - so what? We are talking of the wild ones and comparing the Bajan ones with those at the Jap nesting sites.

Pick D.
~Abhay

Believe those who are seeking the truth. Doubt those who find it. -- Andre Gide
Join the discussion

by ssgmatter » Thu Jul 08, 2010 7:48 am
albatross86 wrote:Fact 1: Atlantic and Pacific loggerheads are two DISTINCT groups.
Fact 2: 95% of DNA samples from Baja & Japanese match

Conclusion: Fact 2 suggests that these turtles that feed in Baja actually hatched in Japanese waters.

WEAKENER

A. There are nesting sites north of Baja - this is irrelevant as it does not dispute the DNA evidence.

B. This talks about something completely different- Atlantic turtle nesting and feeding sites. Irrelevant.

C. An irrelevant statistic.

D. Booyah! 95% of the DNA samples also match the Atlantic turtles. Now we could then infer, by the same reasoning, that these turtles hatched in Atlantic waters, which contradicts both Fact 1 (which claims that the two are distinct) and the conclusion!

E. Aquariums have been breeding them - so what? We are talking of the wild ones and comparing the Bajan ones with those at the Jap nesting sites.

Pick D.
Thankyou dude!

Can you please explain the reason for why C is incorrect in more details.

Cheers!
Best-
Amit
Join the discussion

by albatross86 » Thu Jul 08, 2010 7:54 am
C. Loggerhead hatchlings in Japanese waters have been declining in number for the last decade while the number of nesting sites near the Baja peninsula had remained constant.
So we have two distinct facts here:
1. The number of turtles that have hatched in Japanese waters has been decreasing over the past 10 years
2. Number of nesting sites in Baja has been constant.

This does not mean that the Bajan turtles could not have hatched in Japanese waters. Perhaps the number of turtles that nest in this peninsula has also decreased proportionally.

You could imagine that the two are somehow related in order to argue that perhaps this disproves the conclusion. But this would require you to bridge these two facts and accept them as related/connected and also to make several assumptions. Remember we are not looking for a counter-argument, but something which if true directly attacks the stated argument.

As a true statement, these statistics do not serve to weaken the argument that the turtles that nest in Baja, hatched in Japanese waters.
~Abhay

Believe those who are seeking the truth. Doubt those who find it. -- Andre Gide
Join the discussion