57 The age structure and sex composition of a population is represented by a population pyramid. Discus the shape of population pyramid of
developing and developed couphies
Oh developed countries are​

Which barrier to economic development is shown in the following examples?

(10 points) 1. cone 2. rectangle 3. triangle 4. circle 5. cylinder a. perpendicular cross section of a pyramid b. perpendicular cross section of a cylinder c. parallel cross section of a sphere d. shape created when a rectangle is rotated about the y-axis e. shape created when a right triangle is rotated about the y-axis

Which of the following groups did not invade northern europe? ottomans celts vikings romans (i believe that it is either ottomans or celts)