Vocal sounds are:

a. mechanical or b. electromagnetic

Mark brainliest please

Explanation:

In order for the sound to be clear and not raspy or hoarse, the vocal folds must vibrate together symmetrically and regularly. So B

in the year 2850, humans successfully colonized mars. the martian modules that were constructed could hold only a small population of people. it is now a century later, and the population on mars has grown to 600 people. of the current mars population, 45 people express the recessive phenotype for phenylketon- uria (pku) syndrome (pp genotype).

explanation: