Teach students about the diversity of the natural world From the Young Naturalist Company, this hands-on study of 10 important crops and their by-products uses real crop specimens to teach students about the diversity of the natural world through such concepts as classifying, analyzing, and using dichotomous keys.. Includes: 10 real crops each carded, labeled and bagged, 10 crop by-products, and Teacher's guide with 8 hands-on activities. Grades 1-12