Scientist Ellen Dissanayake believes that early humans might have started creating vocal music, or music with the voice, because the rhythm of the sounds helped them keep pace during physical work. This is an example of which role of music? Communication
Entertainment
Social bonds
Adaptive function

Photography has changed its subject matter quite a lot over the past few years. in the 1800's, it was considered normal for families to have  post mortem photos of their loved ones, and now that would be completely unacceptable. i think that photographers have always pushed boundaries and have been eager to capture everything, it is just society that changes their boundaries.

Idon’t think it’s true but if it is then you should make up a case then prove it