Jawapan

2016-06-14T00:49:10+08:00
Polymers are very big and heavy chemical compounds. We can distinguish two kinds of those - natural and artificial. Natural are called the main building materials of living matter. Artificial are used everyday as they are paints, lacquers, plastic and many many more artificially made things. You should be able to look up more 'bout it on the net however ^^