A nutrient is a chemical that an organism needs to live and grow or a substance used in an organisms metabolism which must be taken in from its environment. Nutrients are the substances that enrich the body. Methods for nutrient intake vary, with animals and protists consuming foods that are digested by an internal digestive system, but most plants ingest nutrients directly from the soil through their roots or from the atmosphere. Some plants, like carnivorous plants, externally digest nutrients from animals, before ingesting them. Organic nutrients include carbohydrates, fats, proteins (or...