What do population pyramids illustrate? a. the distribution of males and females at various ages b. the changes in the population growth rate since the last ice age c. the changes in birthrate since the industrial revolution d. the distribution of high death rates in undeveloped regions

What is the speed of sound in water

Stone mountain was formed during the formation of the blue ridge mountains around 300-350 million years ago and is considered part of the appalachian mountains. it formed as a result of the upwelling of magma from within the earth's crust. this upwelling, or solidified to form the that became stone mountain.

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.