Assertion: humpback whale's song | /r/CapableOf | change over time
Facets:
value: gradually
type: MANNER
Source sentences:
text: Over time the song gradually changes.
text: These songs consist of whistles and low moans and gradually change over time (it would get boring singing the same song over and over!).
text: Over time, the song will change, and if the new song is catchy enough, it will spread to other populations of whales.
text: Over time the song may change but all the singing males will remain in tune with one another.
text: We do know all males within a population sing the same song that changes gradually over time.
text: Other research has found that these songs change over times, and whales learn them much like a human learns a new song, bit by bit.