At which of the given categories, lesser is the difficulty of determining the relationship to other taxa at the same level?DivisionClassOrderGenus

To determine the difficulty of establishing relationships among taxa at the same taxonomic level, we need to analyze the hierarchy of biological classification.

1. Taxonomic Hierarchy Overview: The biological classification system is hierarchical, starting from broad categories to more specific ones. The common hierarchy is as follows:

   • Domain
   • Kingdom
   • Division (or Phylum)
   • Class
   • Order
   • Family
   • Genus
   • Species

2. Comparison of Taxa Levels:

   • Division: This is a broad category that encompasses many classes. It is difficult to determine relationships within a division because it includes a wide variety of organisms.
   • Class: More specific than division, a class includes several orders. The relationships are still relatively broad, but not as varied as at the division level.
   • Order: This level narrows down the group further and is more specific, thus making it easier to determine relationships among the taxa within that order.
   • Genus: This is very specific and usually includes closely related species. The difficulty in establishing relationships at this level is minimal since the organisms are very similar.

3. Conclusion: The lesser difficulty in determining relationships to other taxa at the same taxonomic level is found at the Genus level because organisms within a genus share a more recent common ancestor and are more closely related than those in broader categories like Division or Class.

Therefore, Genus is the category with the least difficulty in determining relationships to other taxa at the same level.