Written test or quiz.
Plants provide oxygen to animals.
A lawn of 4,000 sq. Plants in the world forests, rangelands and the tropical rain forest provide oxygen globally. Plants provide fiber which is manufactured into fabric and clothing. Plants can be used to produce shelter, fencing, roofing materials and other building materials. Plants also produce many by-products such as turpentine, dyes, resin, mulch, decorative bark, etc.