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Skeletal structures are common between two animals of different species. These structures probably exist because both species
A have a common food source.
B live in the same environment.
C have survived until the present time.
D are related to a common ancestor.

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Shemmarzan470viz

Skeletal structures are common between two animals of different species. These structures probably exist because both species are D. Related to a common ancestor.

These structures are called Homologous Structures.

Homologous structures

  • These are structures which are similar in related organisms.
  • these are found in organisms with common ancestry
  • Example: a chimpanzee and human arm are homologous structures since they have a common ancestor. Another example, a bird's wing, dolphin's flipper, a cat's leg, and human arm
  • these are structures with similar anatomical features within different animals
  • supports the idea that they descend from a common ancestor and is an evidence of an evolution
  • these homology may refer to form but not in function

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