AP Biology

Category - Biology

Of the following, which of the groups below has the smallest number of species?
  1. Order
  2. Kingdom
  3. Phylum
  4. Class
  5. Genus
Explanation

Answer: E, genus. Genus is the sixth level of classification, only followed by species.

Key Takeaway: The hierarchical classification of organisms is typically sequenced as: kingdom, phylum, class, order, family, genus, and species. Organisms are grouped based on general characteristics starting at the broadest level (kingdom). For instance, all members of the Kingdom Animalia are eukaryotic, setting them apart from bacteria. As we move down each classification level, the organisms are grouped based on more specific shared characteristics, narrowing the diversity and leading to fewer species within each subsequent category.

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