Use this link to watch the Video on Population pyramid
https://www.youtube.com/watch?v=Tuz6jyxRGSg
Use this link to do Quiz on Population pyramid
http://www.proprofs.com/quiz-school/story.php?title=population-quiz-1
https://www.youtube.com/watch?v=Tuz6jyxRGSg
Use this link to do Quiz on Population pyramid
http://www.proprofs.com/quiz-school/story.php?title=population-quiz-1