Last visit was: 23 Apr 2026, 12:33 It is currently 23 Apr 2026, 12:33
Home
Messages
Tests
Schools
Events
Close
GMAT Club Daily Prep
Thank you for using the timer - this advanced tool can estimate your performance and suggest more practice questions. We have subscribed you to Daily Prep Questions via email.

Customized
for You

we will pick new questions that match your level based on your Timer History

Track
Your Progress

every week, we’ll send you an estimated GMAT score based on your performance

Practice
Pays

we will pick new questions that match your level based on your Timer History
Not interested in getting valuable practice questions and articles delivered to your email? No problem, unsubscribe here.
Go to My Error Log Learn more
Close
Request Expert Reply
Confirm Cancel
Back to Forum
Create Topic
User avatar
hunglq
User avatar
Joined: 24 Aug 2019
Last visit: 04 Aug 2024
Posts: 2
Own Kudos:
5
 [3]
Given Kudos: 1
Posts: 2
Kudos: 5
 [3]
Deleted Updated on: 25 May 2023, 04:30
Originally posted by hunglq on 14 Apr 2023, 20:09.
Last edited by hunglq on 25 May 2023, 04:30, edited 1 time in total.
2
Kudos
Add Kudos
1
Bookmarks
Bookmark this Post
00:00
Start Timer
Pause Timer
Resume Timer
Show Answer
Hide
Show
History
N
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!

Difficulty:

(N/A)

Question Stats:

0% (00:00) correct 0% (00:00) wrong based on 13 sessions

History

Date
Time
Result
Not Attempted Yet
Deleted
User avatar
hunglq
User avatar
Joined: 24 Aug 2019
Last visit: 04 Aug 2024
Posts: 2
Own Kudos:
5
 [2]
Given Kudos: 1
Posts: 2
Kudos: 5
 [2]
Deleted 14 Apr 2023, 20:12
2
Kudos
Add Kudos
Bookmarks
Bookmark this Post
Hello Experts, can you help me with this question. I am confused between B and C.
User avatar
dprasadd
User avatar
Joined: 16 Feb 2023
Last visit: 03 Jun 2024
Posts: 18
Own Kudos:
9
Given Kudos: 29
Location: India
Posts: 18
Kudos: 9
Deleted 15 Apr 2023, 06:29
Kudos
Add Kudos
Bookmarks
Bookmark this Post
hunglq
Can anyone help me with this question?
I do not have the official answer.
-----
The bird species Myiobius barbatus (the bearded flycatcher), which forages in relatively dense vegetation, and Platyrinchus saturatus (the cinnamon-crested spadebill), which forages in open areas or low density vegetation, share territory in French Guiana with Thamnomanes caesius (the cinereous antshrike), which emits a loud alarm call when it detects predators. Biologist Ari Martinez and colleagues, who studied the ecological community the species share, hypothesized that there is an inverse relationship between birds' field of vision while foraging and their sensitivity to alarm calls from neighboring species

Which finding, if true, would most directly support Martinez and colleagues' hypothesis?

A. When Martinez and colleagues played T. caesius alarm calls. M. barbatus and P. saturatus displayed no reaction, whereas T. caesius displayed predator-avoidance behavior.

B. Many local bird species with similar foraging habits to those of M. barbatus displayed no reaction when Martinez and colleagues played T. caesius alarm calls, whereas M. barbarus displayed predator -avoidance behavior.

C. Some individuals of P. saturatus displayed predator-avoidance behavior when Martinez and colleagues played T. caesius alarm calls, whereas nearly all did when M. barbatus alarm calls were played.

D. P. saturatus displayed no reaction when Martinez and colleagues played T. caesius alarm calls, whereas M. barbaris displayed predator avoidance behavior in response to the calls.
Show more

IMO the answer should be D.

A/c to the argument there is an inverse relationship between birds' field of vision while foraging and their sensitivity to alarm calls.

It's also mentioned that M.barbatus forages in dense vegetation meaning less field of vision and hence more sensitivity to alarm calls and vice-verse for P.saturatus.

D satisfies this hypothesis from Martinez and colleagues so, D is the answer.
User avatar
HarshaBujji
User avatar
Joined: 29 Jun 2020
Last visit: 23 Apr 2026
Posts: 723
Own Kudos:
906
Given Kudos: 247
Location: India
Products:
My Reviews
Posts: 723
Kudos: 906
Deleted 15 Apr 2023, 06:59
Kudos
Add Kudos
Bookmarks
Bookmark this Post
I think C is the best fit.


As it highlights the difference between P. saturatus and M. barbatus reactions to alarm calls from neighboring species. It shows the inverse relation that the argument mentions.

Hence IMO C
User avatar
KarishmaB
User avatar
Joined: 16 Oct 2010
Last visit: 23 Apr 2026
Posts: 16,441
Own Kudos:
79,396
 [1]
Given Kudos: 484
Location: Pune, India
Expert
Expert reply
Active GMAT Club Expert! Tag them with @ followed by their username for a faster response.
Posts: 16,441
Kudos: 79,396
 [1]
Deleted 17 Apr 2023, 05:56
1
Kudos
Add Kudos
Bookmarks
Bookmark this Post
hunglq
Can anyone help me with this question?
I do not have the official answer.
-----
The bird species Myiobius barbatus (the bearded flycatcher), which forages in relatively dense vegetation, and Platyrinchus saturatus (the cinnamon-crested spadebill), which forages in open areas or low density vegetation, share territory in French Guiana with Thamnomanes caesius (the cinereous antshrike), which emits a loud alarm call when it detects predators. Biologist Ari Martinez and colleagues, who studied the ecological community the species share, hypothesized that there is an inverse relationship between birds' field of vision while foraging and their sensitivity to alarm calls from neighboring species

Which finding, if true, would most directly support Martinez and colleagues' hypothesis?

A. When Martinez and colleagues played T. caesius alarm calls. M. barbatus and P. saturatus displayed no reaction, whereas T. caesius displayed predator-avoidance behavior.

B. Many local bird species with similar foraging habits to those of M. barbatus displayed no reaction when Martinez and colleagues played T. caesius alarm calls, whereas M. barbarus displayed predator -avoidance behavior.

C. Some individuals of P. saturatus displayed predator-avoidance behavior when Martinez and colleagues played T. caesius alarm calls, whereas nearly all did when M. barbatus alarm calls were played.

D. P. saturatus displayed no reaction when Martinez and colleagues played T. caesius alarm calls, whereas M. barbaris displayed predator avoidance behavior in response to the calls.
Show more

Myio forages in dense vegetation (so they have low field of vision. They cannot see very far because of trees blocking view all around).
Platy forages in open areas (so high field of vision...can see far in open areas)
Thamno emits a loud call when it detects predators

Biologists hypothesized that there is an inverse relationship between birds' field of vision while foraging and their sensitivity to alarm calls from neighboring species.

What would help this hypothesis?

If Myio (low field of vision) reacted to warning calls from other species but Platy (high field of vision) did not react, then that would support our hypothesis.

A. When Martinez and colleagues played T. caesius alarm calls. M. barbatus and P. saturatus displayed no reaction, whereas T. caesius displayed predator-avoidance behavior.

This says that Myio and Platy both did not react to warning calls which came from other species and only Thamno reacted (to a call supposedly coming from its own members).
This does not establish any connection between the field of vision and warning calls.

B. Many local bird species with similar foraging habits to those of M. barbatus displayed no reaction when Martinez and colleagues played T. caesius alarm calls, whereas M. barbarus displayed predator -avoidance behavior.

Myio and Myio like species both have same field of vision (because of same foraging habits in high vegetation areas). If one reacted but the other did not, it doesn't help our hypothesis which compares high field of vision with low field of vision.

C. Some individuals of P. saturatus displayed predator-avoidance behavior when Martinez and colleagues played T. caesius alarm calls, whereas nearly all did when M. barbatus alarm calls were played.

Here, the distinction is being made between the warning calls (Thamno's warning call vs Myio's warning call). Myio's warning call has not been discussed anywhere in the argument. We are discussing different fields of vision, not different warning calls.

D. P. saturatus displayed no reaction when Martinez and colleagues played T. caesius alarm calls, whereas M. barbaris displayed predator avoidance behavior in response to the calls.

Platy did not react on Thamno's warning calls but Myio did react. This is what we were looking for. This does support our hypothesis.

Answer (D)
Moderators:
GMATNinja
GMAT Club Verbal Expert
7391 posts
AbhishekP220108
501 posts
bhanu29
358 posts