Nutrition is the sum total of the processes involved in the taking in and the utilization of food substances by which growth, repair and maintenance of the body are accomplished. It involves ingestion, digestion, absorption and assimilation. Nutrients are stored by the body in various forms and drawn upon when the food intake is not sufficient. - http://www.healthguidance.org/entry/9975/1/What-Is-the-Definition-of-Nutrition.html
Plants use CO2 from the atmosphere and water from the ground to build complex molecules. This is called autotrophic nutrition. This process in plants is driven by light energy via photosynthesis. Many factors determine the rate of photosynthesis in plants.
Animals, fungi and many forms of bacteria use complex molecules formed by plants, either directly, by consuming plant material, or indirectly by consuming other organisms or dead material. Getting complex molecules from the cells of others is called heterotrophic nutrition. - http://vle.camsfc.ac.uk/evs/w22_ideas.htm
· 9 years ago