Bacterial fossils have been discovered that date back 3.5 billion years ago. There are over 5,000 different species of bacteria known, many of which are harmful or pathogenic (i.e. can cause disease) and some of which are beneficial and can have many uses, for example, the bacterial species Lactobacillus is used in the production of cheese and yoghurt. The bacteria Bifidobacterium adolescentis is used for yoghurt making and Brevibacterium aurantiacum is used for cheese making. Also yeast is used
Introduction First of all I want to explain why I have chosen this topic to present. When I was learning English language at school I was always curious why this or that word was pronounced differently and somehow strange. My teacher was trying to do her best and explain but anyway I was always dissatisfied. Now as I am a student and I am learning English language thoroughly I have a great chance to discover for me many things and to give answers to those questions that were disturbing me so much