Evidence for Evolution

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Evidence for Evolution

Biogeography

Modern biogeographic research combines information and ideas from many fields from the physiological and ecological constraints on organismal dispersal.

Pangea

1. About 300 million years ago, the supercontinent called Pangea existed and it began to break apart about 175 million years ago. (I don't believe that the earth existed that long.) 2. The concept was first proposed by Alfred Wegener. 3. Pangea is Greek for Earth.

VISUAL https://sp.yimg.com/xj/th?id=OIP.M9ab5ae1c1cc09e9c9cd51bed0589e136H0&pid=15.1&H=158&W=160&P=0

Biogeography is the study of the distribution of species and ecosystems in geographic space and through (geological) time.

Zoogeographic Regions

1. Geographic distribution of animals. 2. Philip Sclater is regarded as the father of zoogeography. 3. Palearctic and Oriental

VISUAL https://sp.yimg.com/xj/th?id=OIP.M81108af5afd3045f55002f00a756d055o0&pid=15.1&P=0&w=300&h=300

Fossil Record

Sequential Nature of Fossil Record

1.The species has to be buried quickly and deeply for it the be preserved into a fossil. 2. Scientists are studying the erosion and preservation of fossils. most will erode before anyone gets to them. 3. A Marine Mollusk and a lungfish

VISUAL https://sp.yimg.com/xj/th?id=OIP.M82cca208c049f7ea46c24bb44620772ao0&pid=15.1&P=0&w=300&h=300

A term used by paleontologists to refer to the total number of fossils that have been discovered, as well as to the information derived from them.

Stasis

1. Little net evolutionary change for most of a fossil's geological history. 2. Scientists just call it stasis because it's a lack of change. 3. A thornback ray fossil and oyster fossils.

VISUAL https://sp.yimg.com/xj/th?id=OIP.Mda7ee8fabfd5b6fa3787581db77e9871o0&pid=15.1&H=165&W=160&P=0

The fossil record thoroughly examines the evidence to determine which worldview- creation or evolution- presents the most accurate portrayal of earth's early history.

1. The fossil record does not show gradual change; it shows sudden appearances followed by stasis. 2. They often represent lengthy periods of time. It actually supports the creation model. 3. The Cambrian Explosion and the fish-amphibian transition.

VISUAL https://sp.yimg.com/xj/th?id=OIP.M063e26445a1356ab3c441dcfd475f0d5o0&pid=15.1&H=120&W=160&P=0

Analogous Structures

Structures of different species having similar or corresponding function but not from the same evolutionary origin.

Analogous structures can provide information about how natural selection leads to similar adaptations in the same envireonment.

Homologies

Developmental

1. Species that differ as adults often bear striking similarities during embryonic stages. 2.Scientists are studying the developmental stages of different species called the embryo to compare certain species. 3.Scientists compare the embryo of reptiles, birds, fish, and mammals.

VISUAL http://faculty.ycp.edu/~kkleiner/EvolBio/EvolBioImages/EvidenceforEvol/Developmentalhomologies.jpg

Vestigial Structures

Embryology

Derived from a common ancestor form but different shape and function.

Molecular

1. Similarities in cells at the molecular level indicate that living species evolved from a common ancestor. 2. The structure and function of all living organisms depends on biologic molecules called protein. 3. All living species use DNA to store information. Certain biochemical pathways are found in all species.

VISUAL http://bio1903.nicerweb.com/Locked/media/ch22/22_16HemoglobinHomology.jpg

Evolutionists attribute biological similarities- this "homology"- to a "common ancestor" among diverse creatures.

Anatomical

1. Similarity between characteristics in different species of organisms. 2. Biological structures are similar because they conform more or less to pre-existing patterns. 3. Bats and butterflies (wings). Bats and whales (bones in wings and flippers).

VISUAL https://sp.yimg.com/ib/th?id=OIP.Mc275cf5a60a4de5611f162cb6d9e9cf2o0&pid=15.1b

Sudden Appearance

Subtopic