Question

how can i make my working model of biology for class 9th?????

Answer 1

you make a turbindor so first take a plastiv big bottle and a metal string and 2 circle of paper and 5 cap of bottles so first take one cicle and stick 5 caps of bottle vertically and stick other circle on caps and then put the metal string on the centre of paper and stick the string on bottle and in upper side make a hole then fill the bootle of water and ther turbindor run .