Ideas that shaped Darwin’s thinking

 Prior to Darwin’s Theory of Evolution there were 4 scientists that had their own ideas and theory’s  1. Hutton  2.Lyell  3.Lamarck  4. Malthus The Rock Boys!! The Math guy!

 Helped scientists understand that Earth is many millions of years old  Processes that changed the Earth in the past are the same processes that operate in the present

 In Lyell’s book: Principles of Geology  Rock Cycle: Volcanoes and Earthquakes  Erosion continues to carve out canyons.

 Uniformitarianism: the natural laws and processes that operate in the universe now, have always operated in the past. Uniformitarianism How do you pronounce that??

 Use or disuse of organs, organisms acquired or lost certain traits during their lifetime.  Traits could then be passed on to their offspring.

 Malthus reasoned that if the human population continued to grow unchecked, sooner or later there would be insufficient living space and food for everyone.  Do you remember:  Density Independent factors  Density dependent factors

 He theorized that there was a “carrying capacity” in every habitat/ environment  Populations will naturally get checked by famine, disease etc.

 1. Change over time, common ancestor  Pre-existing variation  2. Variation within a population or species  Everyone is just a little different  3. Natural selection  Survival of the fittest

 1. Fossil Record  2. Geographical Distribution  3. Similarities in Structure  Homologous/Analogous Structures  4. Vestigial organs  5. Similarities in Early development  Embryology Yes, I can support it!

 Preserved remains or markings left by organisms that lived in the past are called fossils.

 Position of fossils can reveal their age. Younger Older

 Organisms in different parts of the world shared similarities

 Homologous structure: same basic structure but different function  Analogous structure: same basic function, but do not have the same basic structure

 Homologous structures: similar structures but have different function  Derived from a common ancestor  Ex. Forelimb

 Analogous structures: similar function but not similar in structure  Not derived from a common ancestor  Ex. A butterfly wing and a bird wing

 Organs of many animals are so reduced in size that they are just vestiges, or traces, of homologous organs in other species I have toe nails!!!

 Common pattern in the development  In their early stages, chickens, turtles, and rats look similar, providing evidence that they shared a common ancestor

 Adopt an Embryo!  Select one embryo to adopt as your own!!

 Adopt an Embryo! 

 Stage 2 

 Stage 3

 1. Fossil Record  2. Geographical Distribution  3. Similarities in Structure  Homologous/Analogous Structures  4. Vestigial organs  5. Similarities in Early development  Embryology Yes, I can prove it!

HOMOLOGOUS STRUCTURE  Same Structure different function ANALOGOUS STRUCTURE  Same function different structure Instructions: 1.Read 2.Define 3.Color 4.Chart 5.Answer Questions