Uses a cow's eye to show the parts of the eye, including lens, pupil, iris, retina, cornea, sclera, choroid, vitreous humor and ciliary body. Expla...
Shows the factors required by green plants for life and growth: sunlight, carbon dioxide, water, and soluble minerals; and describes the process of...
Defines vitamins, how they work in the human body, and the foods which contain various vitamins. Debunks many myths about vitamins and explains the...