When the sound from two sound waves goes up and down (loud, soft, loud, soft) it makes a distinctive sound pattern called beats. these beats are caused by a difference in
select one:
a. formants.
b. frequencies.
c. wavelengths.
d. harmonics.

The beats are actually two new sounds.

Their frequencies are (the sum of the original two frequencies) and (the difference of the original two frequencies).

The existence of the beats is the result of the difference in the frequencies of the original two sounds. (b)

it is because acrylic blanket have acrylic textile fiber

explanation:

its is better than wool blanket

b. latent learning (the word "latent" itself means something that exists but isn't obvious, only under certain conditions! )