Aim: What is the theory behind life’s great diversity ? Key Idea 3 Individual organisms and species change over time


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Aim: What is the theory behind life’s great diversity ?

  • Key Idea 3 Individual organisms and species change over time.

  • Objective:

  • Explain how the three processes of Evolution worked together to yield our present organisms


Evolution is the change of species over time.

  • The diversity of life (millions of different species) on Earth today is the result of natural selection occurring over a vast amount of geologic time

  • The origins of evolutionary thought was laid during the 1700s and 1800s.

  • Charles Darwin Evolution: Who Was Charles Darwin?



On a five-year voyage on the Beagle, Charles Darwin visited several continents and many remote islands. Darwin’s observations led to a revolutionary theory about the way life changes over time.



Giant Tortoises of the Galápagos Islands





Isabella Island Tortoise



Darwin’s Book On the Origin of Species




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