Study Outline. 1  Microbiology-An Introduction. 2  Microbiology is the study of organisms too small to be clearly seen by the unaided eye (i.e., microorganisms); these include viruses, bacteria, archaea, protozoa, algae, and fungi.tudy Outline. 1  Microbiology-An Introduction. 2  Microbiology is the study of organisms too small to be clearly seen by the unaided eye (i.e., microorganisms); these include viruses, bacteria, archaea, protozoa, algae, and fungi.
Well, according to the CIA's The World Factbook, the current average human lifespan is approximately 66 and a half years. On average the current life expectancy for the world is about 67.2 years.
Worldwide, the average life expectancy at birth was 71.0 years (68.5 years for males and 73.5 years for females) over the period 2010â2013 according to United Nations World Population Prospects 2012 Revision, or 70.7 years (68.2 years for males and 73.2 years for females) for 2009 according to The World Factbook.