Controversial Essay on Cruelty to Animals to Save Human Beings. In the late eighties an Indian was demonstrating the skill of his bear in 'Festival of India' in Germany. Members of a humanist group caught hold of the man and he was sent back to India.
Necessity of resources for human beings: Human beings use resources as raw material to satisfy their needs and comforts. They use them for making clothes, food, construct houses, set up industries etc.
Man as a species evolved in the same general way as other species. The raw material for organic evolution is provided by payment changes that occur. In the hereditary units called genes.
Alimentary Canal In human beings, alimentary canal measures between 8 to 10 meters in length. It has the following parts: Oral Cavity, Oesophagus, Stomach, Small intestine, and large intestine.
The human body has various organs for the purpose of excretion such as lungs, skin, large intestine and urinary system. Lungs excrete carbon dioxide and water vapor formed during the process of respiration. Skin removes urea, salts and excess water as sweat produced by sweat glands present in the skin. Sweat is removed through tiny pores in the skin.
The respiratory system in human beings consists of the following organs: nose, pharynx, trachea, bronchi and lungs. Nose encloses a nasal cavity which opens to the outside through two nostrils. Nose has fine hair and a sticky liquid, mucus, produced by the inner lining of the nose, both of which serve to filter the air entering the nasal cavity.