People in the “prime of life” (aged roughly 20-60), support the populations younger and older than themselves. How might this impact the quality of life in countries with the various shapes of demographic pyramids?

hammurabi rulers

good lesson

b) charles darwin i learned that last year!

the flagellates share a facultative mutualist association with termites. mutualism is a biological interaction between individuals of different species, where both benefit from each other. this is called cooperation and it differs from other interactions such as cases of exploitation, such as parasitism, predation. in this interaction called association, both species cooperate and benefit.