Digestive system human body 100 slide easel activity Practice all basic and details first 40 pages for beginner students with sound for kids cannot read well and with small text and simple informations and a lot of pictures questions suitable for grade 1- grade 4the next 20 without sound and manage difficult question suitable 3- 5 the last 40 pages with long text and details and much harder questions suitable grade 5- grade 7 topics covered in in this activity:what is digestive system?what is it