The interval that occurs when two different tones blend so well when sounded together that they seem to merge into one tone, is called a(n)

The interval is called the octave when two different tones blend so well when sounded together that they practically seem to combine into one tone. Octaves are notes that is heard as being the same in spite of being higher or lower in actual pitch. Octaves from the science perspective are pitch intervals connected by two factors. It is a central mystery of human cognition in hearing pitches linked by powers of two as presence the same note. The capability to notice octave equivalency is perhaps constructed into the brains and it is not restricted to humans. The rhesus monkeys have been exposed to be capable to detect octave as some other mammals.

Oh my good luck with that i’m sorry you have to do that

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.