Because the user can draw directly to the screen, light pens are used by graphics artists, though they are not as accurate as digitizing tablets. The pen works with CRT monitors but is not as compatible with projectors, LCD screens and other display devices.
THE DEFINITION OF NUTRIENTS. The definition of nutrients is a substance that provides nourishment for growth or metabolism. Plants absorb nutrients mostly from the soil in the form of minerals and other inorganic compounds and animals obtain nutrients from ingested foods. THE SIX ESSENTIAL NUTRIENTS PEOPLE NEED.
Fats and oils are concentrated sources of energy and so are important nutrients for young children who need a lot of energy-rich food. Fats can also make meals more tasty and satisfying. Fat is found in meat, chicken, milk products, butters, creams, avocado, cooking oils and fats, cheese, fish and ground nuts.lthough most foods are mixtures of nutrients, many of them contain a lot of one nutrient and a little of the other nutrients. Foods are often grouped according to the nutrient that they contain in abundance (see Box 2.1).