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7.4 The Evidence for Evolution. Pages 296-302. biogeography. The study of the distribution of organisms. Galapagos Islands. Darwin on the HMS Beagle. 1831-1836 Galapagos Islands, 1000 km off the west coast of S. America No large land mammals or amphibians

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  • The study of the distribution of organisms
darwin on the hms beagle
Darwin on the HMS Beagle
  • 1831-1836
  • Galapagos Islands, 1000 km off the west coast of S. America
  • No large land mammals or amphibians
  • Strange reptiles, birds, insects and plants, similar to those found on nearest continent
no fear
No fear!!
  • Birds land on your head.
  • Iguanas allow you to pick them up.
  • Sea lions sit beside you.

loss of instinctive fear?

unique species
Unique species
  • Arrived by water or air then changed into new species over time
comparing iguanas
Comparing iguanas
  • Mainland iguanas have short claws for climbing trees.
  • Galapagos iguanas have long claws for hanging onto slippery rocks.
homologous features
Homologous Features
  • A structure with a common evolutionary origin currently used in different ways.
  • 7 neck bones
  • 28 skull bones
  • Bat skeleton Human skeleton
homologous embryonic development
Homologous embryonic development
  • Human embryos

have gill slits.

analogous features
Analogous Features
  • Body parts that perform the same function but do not share similar origin or structure

fly eye rabbit eye

analogous features1
Analogous features

Dragon fly wing vs. bird wing

vestigial features
Vestigial features

Dew toes in dogs hip bones in whales

thomas malthus
Thomas Malthus

The Principle of Population

All populations were limited in size by their environment—and in particular their food supply.