Sixth mass extinction
SIXTH MASS EXTINCTION Currently we are experiencing a sixth mass extinction. ... This extinction is more severe than the others, because we are the one’s responsible for the destruction of our biosphere. ... The first major mass extinction occurred around (c. ... This extinction affected most of the marine life since there was little or no life on land about twenty-five percent of families were lost. The major cause for this extinction was the climate change, it suffered severe and sudden global cooling. The second mass extinction occurred (c. ... The third mass extinction which occurred at the end of the Permian period is considered one of the greatest mass extinctions events of them all. ... The fourth major extinction (c. ... The exact cause for this extinction was very difficult to determine.