The hen performs three vital functions - nutrition, respiration, and excretion. It is an omnivorous and insectivorous animal that feeds on organic matter produced by other living beings. It has systems to digest food, breathe through lungs, and excrete waste like uric acid. The hen has senses like sight, smell, taste, hearing and touch that help it interact with its environment. It has a nervous system with a brain and spinal cord that coordinates responsive organs like muscles and glands. Reproduction for the hen involves sexual reproduction through internal fertilization and laying eggs. Hens are commonly found on farms all over the world where they are domesticated for their meat, eggs, and feathers.