Whereas in insects the small organs that collect oxygen from the

See how parallelism error looks like.

A. whereas in insects......, in mammals....

B Whereas the small organs ....., mammals have organs...

C unlike insects....., mammals' organs

D Unlike insects...., organs of mammals..

E Unlike small organs......, in mammals the organs. Moreover wrong placement of which and wrong meaning of statement.

A fits well.

Dear Friends,

Here is a detailed explanation to this question-


Choice A: This answer choice maintains proper comparison, comma use, and pronoun use and is quite concise. Thus, this answer choice is correct.

Choice B: This answer choice incorrectly compares "small organs" to "mammals", rather than to the "mammals' organs". Additionally, "the small organs for the collecting of oxygen from the atmosphere are distributed in insects throughout the body" is a highly awkward phrase due to the excessive use of the passive voice. Thus, this answer choice is incorrect.

Choice C: This answer choice incorrectly compares "insects" to "mammals' organs", rather than to "mammals". Additionally, this answer choice uses the word "where" to refer to "insects"; "where" is only to be used to refer to places. Thus, this answer choice is incorrect.

Choice D: This answer choice repeats the comparison error seen in Option C. This answer choice also presents vital information between two commas; if the phrase "in whom the small organs that collect oxygen from the atmosphere are distributed throughout the body" is removed, this sentence will be incomplete. Thus, this answer choice is incorrect.

Choice E: This answer choice incorrectly compares "organs" to "in mammals". This answer choice also presents vital information between two commas; if the phrase "which in insects are distributed throughout the body" is removed, this sentence will be incomplete. Thus, this answer choice is incorrect. Finally, the modifying phrase "which in insects are distributed throughout the body" incorrectly refers to the noun "atmosphere" due to the use of the "comma + which" connector.

Hence, A is the best answer choice.

To understand the concept of "Extra Information Between Two Commas on GMAT", you may want to watch the following video (~1 minute):



To understand the concept of "Where v/s When on GMAT", you may want to watch the following video (~1 minute):



To understand the concept of "Which, Who, Whose, Where on GMAT", you may want to watch the following video (~1 minute):



All the best!
Experts' Global Team