Read and listen to the story online: http://www.bbc.co.uk/worldservice/learningenglish/general /sixminute/2012/0/120315_6min_english_extinct_men.shtml
Vocabulary and definitions: • chromosome - a very small structure in animal or plant cells • hormones - chemical substances in the body that influence cell function • pessimistic - expecting bad things to happen • ratio - numerical expression of the relative sizes between two or more values • extinction - a situation in which a life form stops existing • breathe a sigh of relief - feel happy that something unpleasant stops • depleted - reduced by a large amount • genes - units in cells that control qualities passed on through generations • natural selection - a process in nature that determines chances of survival • stereotypes - a fixed idea or image that people have about something More: http://vk.com/learning_english