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 71.5 years (68 years and 4 months for males and 72 years and 8 months for females) over the period 2010â2015 according to United Nations World Population Prospects 2015 Revision, or 69 years (67 years for males and 71.1 years for females) for 2016 according to The World Factbook.