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A chord made of tons only a half step or a whole step apart is known as a tone cluster .
Hence OPTION(D) is correct.
tone cluster :
A tone cluster is a musical chord comprising at least three adjacent tones in a scale . prototypically tone cluster are based on the chromatic scale and are separated by semitones . it is used in twentieth century music .
Polytonality :
The technique of using two or more tonal centres at the same time is called polytonality .
A polychord :
The combination of two traditional chords sounding together is known as a polychord . it consists of two or more chords ,one on the top of the other.
Bitonality :
use of two musical keys at the same time is called as bitonality.
Hence OPTION (D) IS correct.
Learn more about musical tones here:
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Explanation: it's right
I believe you are correct in assuming it is a, I had the same question and I put down A as well.
Also, Genetic drift is the change in the frequency of an existing gene variant in a population due to random sampling of organisms. The alleles in the offspring are a sample of those in the parents, and chance has a role in determining whether a given individual survives and reproduces.