Metamorphosis, a period within the lifecycles of certain species of

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Here is a detailed explanation to this question-


Choice A: This answer choice lacks a verb to act upon the subject, "Metamorphosis"; therefore, the application of this answer choice will lead to an incomplete sentence. Thus, this answer choice is incorrect.

Choice B: This answer choice repeats the error found in Option A. This answer choice also uses the word "where" to refer to a process, rather than a place. Finally, this answer choices uses the present continuous tense to refer to the confluence of changes that take place during metamorphosis, implying that it is a currently ongoing process, and for the survival of the immature animal; the correct tense to use to refer to the animal's survival is the present perfect tense, as this sentence is concerned with the animal's survival up until a particular point in time and that survival affects a later event (the animal's reproductive maturation). Thus, this answer choice is incorrect.

Choice C: This answer choice repeats the error found in Option A. Additionally this answer choice changes the meaning of the sentence to imply that during metamorphosis the organism itself and its behavioral changes coincide by utilizing the phrase "in which organism and its behavior changes coincide"; this answer choice further distorts the meaning of the sentence by using the phrase "and which allows...", which implies that the confluence of changes and the maturation of the animal are unrelated actions. Thus, this answer choice is incorrect.

Choice D: This answer choice maintains proper tense use and conveys the intended meaning of the sentence. Thus, this answer choice is correct.

Choice E: This answer choice repeats the errors related to the use of "where" and the continuous tense, seen in Option B. This answer choice also changes the meaning of the sentence to imply that during metamorphosis the organism, itself, and its behavioral changes coincide by utilizing the phrase "organism and its behavior changes are coinciding". Thus, this answer choice is incorrect.

Hence, D is the best answer choice.

To understand the concept of "Simple Continuous Tenses 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):



All the best!
Experts' Global Team