Why have the birth rates decreased in asia, africa, and south america in the recent decades?

People keep spending additional units of a particular resource on a want until their marginal benefit is  decreasing withgreater thanless thannot affected by  their marginal cost.

Residents of moldova are mainly a. russian b. ukrainian c. serbian d. romanian the answer is d. romanian

Why isn't the balkan region good for farming? it has dry summers. it is far from the sea. its soil is not fertile. its terrain is mountainous. its winters are mild.