Answer:
To commemorate something means to remember something and by doing so to honor it, as in “We would like to commemorate his many years of past service by presenting him with this lovely gold watch.”
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The Mouse in "If you give a mouse a cookie", he has a cookie and wants the other thing afterwards. Three qualities the mouse has is he is smart, sometimes greedy and cravings
Yearly is the adverb.
An adverb is a word that modifies verbs, adjectives and other adverbs. In this case "yearly" is modifying "migrate" which is a verb.