researchers found that the canary\'s forebrain shrinks during non mating season

Question

researchers found that the canary's forebrain shrinks during non mating season and enlarges during the mating season. This annual enlargement can be associated with which one of these
a. the annual addition of new syllables to a canary's song repertoire
b. the annual crystallization pf subsong into adult songs
c. the annual sensitive period in which canary parents imprint on new offspring
d. the annual renewal of mating and nest building behaviors
e. the annual elimination of the memorized template for songs sung the previous year

it think the answer is d. could some one please verify or correct

thanks

Explanation / Answer

researchers found that the canary's forebrain shrinks during non mating season and enlarges during the mating season. This annual enlargement can be associated with which one of these a. the annual addition of new syllables to a canary's song repertoire b. the annual crystallization pf subsong into adult songs c. the annual sensitive period in which canary parents imprint on new offspring d. the annual renewal of mating and nest building behaviors e. the annual elimination of the memorized template for songs sung the previous year

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