Other than eukaryotes, name one main / primary evolutionary branch (domain) of life.

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BlackTom AI · Accepted Answer

When approaching the question, imagine the broad tree of life and the major branches scientists recognize.
First, note that the prompt asks for a main evolutionary branch (domain) other than eukaryotes.
Traditionally, life is organized into three domains: Bacteria, Archaea, and Eukarya (or Eukaryota). This three-domain concept groups organisms by fundamental cellular and molecular differences, such as the nature of their cell membranes, ribosomal RNA sequences, and metabolic traits.
Optionally, if the other choices were Bacteria and Archaea, both would be valid as domains distinct from Eukarya; if the only alternative listed was Bacteria, that would also be a correct domain besides the eukaryotic domain.
If someone suggested a single alternative like Archaea, you would explain that Archaea is indeed a primary domain, just as Bacteria is, and both are separate from Eukarya in the three-domain system.
In short, the key idea is that beyond eukaryotes, the principal domains are Bacteria and Archaea, both representing prokaryotic lineages with distinct evolutionary histories and cellular features.

BIO 181 (001&002) FALL 2025 FA25: Exam 3: Phylogeny & Biodiversity (Breathe in, breath out)

Other than eukaryotes, name one main / primary evolutionary branch (domain) of life.

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