The elderly population in the us is expected to increase substantially over the next twenty years. which of the following best explains this population increase?

The us elderly population will increase at a substantial rate of 3.6% over the next 20 years.

Explanation:

This is due to high facilities of medical aid along with low mortality rates especially that of the females is expected to grow more in the future from age of 50 onwards. And continues to remain that way up to 90 years of age according with the population pyramid and sex ratio of the nation. Becoming more of a bell shaped structure.

since there isn't any suggested answers i will give you the reason and hopefully you can figure it

south africa, or rather all of africa, has not been in the location in which it is nowadays throughout the geological past. after the super-continent pangaea started to break apart, gondwanaland, in which was africa, moved further south, and parts of it came to be very close to the south pole. because the climate in this part of the world is very cold due to the very dispersed sun rays in there, what is now south africa, started to freeze, and the conditions were right for the formation of glaciers. the glaciers existed up until the period when gondwanaland started to break apart and what is now africa started to move towards north, sp it warmed up and the glaciers melted.