Origin from Primitive or Stem Forms. - As already observed, the same principles apply to groups of animals as to organs and groups of organs; an organ originates in a primitive and unspecialized stage, a group of animals originates in a primitive or stem form. [Please select]
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As noted by Funkhouser (1962), the small, relatively unspecialized species (_lemur_, _loris_, and _medinae_) form a natural group; possibly this group should be accorded generic recognition. [Please select]
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The skull of _Conophis_ is typical of a relatively unspecialized colubrid snake. [Please select]
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_Lamprey_: Observe here also the primitive or unspecialized form of the body, of the fin, of the jawless mouth, the number of gill slits, and the sense organs. [Please select]
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Although the eastern woodrat is relatively unspecialized in its feeding habits, a few species of favored food plants probably make up the greater part of its diet. [Please select]
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