In general, how do age structures differ from more and less developed countries? From assessment 14.2

In MDCs (More-Developed countries), the age structure is much more rectangular-shaped if you were to represent it in a population pyramid, as there is about an even number of people in each age group. The US is an example of one country that displays this. In LDCs (Less-dev. countries), however, the age structure contains much more people who are younger; if you were to draw the age structure for one of these countries, it would look like a triangle. This is due to a couple reasons: first off, there is likely not a solid health care system, education is likely not, so to speak, top-notch, religion likely has a much greater influence on the people, leading to lots of births and a very high TFR (total fertility rate). Second, numerous people cannot reach old age due to, again, the reasons above.

wadadadwawadwdwdaddwawdwad

when you breathe in, or inhale, your diaphragm contracts (tightens) and moves downward. this increases the space in your chest cavity, into which your lungs expand. the intercostal muscles between your ribs also enlarge the chest cavity. they contract to pull your rib cage both upward and outward when you inhale.