Answer:
B.
Explanation:
Developed in the Baroque Era, the theory of
tonal center or key.
is a sense or pull towards a tonality
Demographic Transition
Population aging is a by-product of the process known as "<em>Demographic Transitioning</em>." This process is determined mostly by fertility and mortality rate. For example: a population that has a high fertility rate has a low amount of older people, and vise versa.