nutrition

• nutrition is the process by which living organisms obtain and make food
• all living things need food to:

  1. energy
  2. grow
  3. produce important chemicals for cellular processes
• autotrophic- where organisms, called autotrophs, use simple inorganic compounds like water, sunlight and carbon dioxide to manufacture simple organic substances like proteins, lipids and vitamins. It occurs in green plants and some bacteria
• heterotrophic- organisms called heterotrophs, obtain ready-made organic food. It occurs in animals, fungi and most bacteria