Which of the following is a correct grouping of living organisms according to the three domain system?

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BlackTom AI · Accepted Answer

To evaluate the question, we first recall the three-domain system of classification: Bacteria, Archaea, and Eukarya represent the broadest living-group divisions.
Option a suggests grouping Bacteria, fungi, and animals, which mixes prokaryotes (Bacteria) with several eukaryotic kingdoms (fungi, animals); this is not the three-domain framework.
Option b lists Prokarya, eukarya, and fungi. 'Prokarya' is an outdated term and does not align with the three-domain system, and placing fungi as a domain itself is not correct since fungi are a part of Eukarya, not a separate domain.
Option c states Bacteria, Archaea, and Eukarya. This matches the canonical three-domain model, with Bacteria and Archaea as two distinct prokaryotic domains and Eukarya containing all eukaryotic organisms (plants, animals, fungi, protists, etc.). This option aligns with current taxonomic consensus based on molecular data.
Option d groups Plants, animals, and protists, which mixes major eukaryotic lineages and omits the recognized separation of prokaryotes (the two domains Bacteria and Archaea) from eukaryotes; it does not reflect the three-domain system.
In summary, options a, b, and d misclassify groups either by combining disparate kingdoms or by using an incorrect or outdated framework, whereas option c correctly identifies the three-domain grouping: Bacteria, Archaea, and Eukarya.

BIO 181 (001&002) FALL 2025 (Additional Attempt Added) 3C - Self-Check: Classifying Biodiversity (LO 3C.1, 3C.2, 3C.3)

Which of the following is a correct grouping of living organisms according to the three domain system?

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