A region of the canary forebrain shrinks during the nonbreeding season and enlarges when breeding season begins. This change is probably associated with the annual a. addition of new syllables to a canary's song repertoire. b. crystallization of subsong into adult songs. c. sensitive period in which canary parents imprint on new offspring. d. elimination of the memorized template for songs sung the previous year.

Video transcript

welcome back. Let's look at our next problem. There is an annual edition of new syllables to a Canary Song Bank. Because and when we look over our answer choices, we see that Choice D. Is all of these. So there is a possibility that all of the three answers above will be correct. So we want to look at the reason why there our new syllables added to Canary's Song Bank every year. So Choice A says there is a positive correlation between the age of the Canary and the addition of new syllables or the volume of the song. So that means as the Canaries age increases, the number of new syllables also increases also volume as well. So obviously new syllables coming with age would result in addition of new syllables to its song bank. The number of songs that has in its repertoire. So Choice A. Is correct. Let's look at Choice B. The addition of new syllables is associated with age. Well, as we said, as a gin creases, the number of new syllables increases. So addition of new syllables associated with age. That is correct. And Choice E says as the age increases, the length of the song also increases while adding new syllables will make the song longer. So that is correct. Also, so Choice D. All of these is correct. These are all reasons why the Canaries total Song Bank has new syllables added each year as the Canaries age increases. Thanks for watching. Let's see you in the next video