Clues, Clues

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Clues, Clues Pick and Choose
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Comparative Anatomy

• A branch of science in which the structures of
  living things are compared to understand the
  development and relationships among species
  better.

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Analogous Structures

• Structures in animals that serve the same purpose
  in different species but evolved independently,
  not from the same structures in a common
  ancestor.

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Homologous Structures

• Similar body parts found in different species.
• Although they may be used for very different
  skills and in very different environments, the
  are similar in their development and their
  pattern within the organism.

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Example

• Comparing the modern day horse with the fossils
  of smaller, horse-like creatures.

Hypohippus
Eohippus
Prezwalskis Wild Horses
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Modern Day Horse
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Embryological Development

• The study of the early stages of life, before
  birth.
• Many organisms are very similar in appearance and
  have common features as embryos but vary greatly
  as adults.
• These similarities are evidence of evolution from
  common ancestors.

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Fish Embryo
Pig Embryo
Chicken Embryo
Human Embryo
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Biochemical Analysis

• Analyzing DNA structures within different
  organisms and comparing the samples.
• The more similar the DNA found within two
  organisms, the more likely they are to be closely
  related.
• This closely matches the fossil record.

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Charles Darwin and Alfred Wallace both made
discoveries, around the same time, that led both
men to form the theory of Natural Selection.
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• Natural selection states that organisms with more
  favorable characteristics are more likely to
  survive and reproduce.