Humble Worm Saliva Can Break Down Tough Plastic

Humble can describe a person who isn't proud or doesn't believe that they're important, even if they are. Humble worm saliva can break down tough plastic - which means destroy certain types of plastic. We've had gobbling, eating quickly and loudly, like a turkey. And humble, not proud, but often important. Don't forget there's a quiz on our website at bbclearningenglish.com.