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Lamarck's ideas about evolution include the concept that differences among the traits of
organisms arise as a result of
O continual increases in population size.
the actions of organisms as they use or fail to use body structures.
an unchanging local environment.
the natural variations already present within the population of organisms.

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According to Lamark's theory of evolution, differences among the traits of

organisms arise as a result of the actions of organisms as they use or fail to use body structures.

The theories of evolution try to explain the changes that occur in living things as new species replace existing ones. There have been two main theories that seek to explain the evolution of organisms'

  • Darwin's theory
  • Lamark's theory

The theory of Lamark deals with use and disuse of body parts. Body parts that are not used begin to degenerate and only appear as relics in new species. A typical example of this is the appendix in humans. Hence, according to Lamark, differences among the traits of  organisms arise as a result of the actions of organisms as they use or fail to use body structures.

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