Select the articles from the following list which are biodegradable.

(a) paper

(b) woolen clothes

(c) wood

(d) aluminium can

(e) plastic bag

(f) peels of vegetables

The biodegradable materials are (a), (b), (c), (f). All these decompose easily unlike the rest of the options given above. That is, the complex compounds break down to simpler ones and go in the soil.