How do age structure diagrams illustrate population distribution?

Which plains area lies in both the united states and canada? altiplano central canadian shield coastal plains great plains

Describe how a student should adjust the microscope to see the cells on a slide more clearly?

This question is only for applicants to scholars for medicine or scholars for dental medicine: what aspects about medicine (or dental medicine) intrigue you? describe how these aspects influence your life. (100-650 words)