-Change in a species over time

1
EVOLUTION

• -Change in a species over time
• -process by which modern organisms have descended
  from ancient organisms

2
EVOLUTION

• Theory made by Charles Darwin after sailing on
  the HMS Beagle on a voyage around the world
• Key evidence found from observations on the
  Galapagos Islands

3
Evidence of Evolution

• Fossils- preserved remains or evidence of an
  ancient organism

4

• Relative Dating- age of a fossil is determined by
  comparing its placement with that of fossils in
  other layers of rock

5
Survival of the Fittest

• Individuals that are better suited to their
  environment survive and reproduce successfully
• adaptation inherited characteristic that
  increases an organisms chance of survival
• Coloration, behavior, anatomical structure
• Results in changes in the inherited
  characteristics of a population
• Also called Natural Selection
• Speciation formation of a new species

6
Vestigial Organs

• Organs reduced in size to the extreme that organ
  has little or no function
• May resemble miniature legs, tails, or other
  structures

7
Homologous Structures

• anatomical similarities among
• body parts of animals

Vary in form and function, YET they all are
constructed from the same basic bones