Place It on the Tree of Life — The Three Domains

The tree of life three domains, one root

Bacteria split off first. Archaea and Eukarya stayed together longer, so they sit as sister branches. Carl Woese drew this tree by comparing ribosomal RNA.

What sets the three apart matching traits light up

Read down a column and you have the whole case. Two traits do most of the work: the nucleus splits Eukarya off, and the wall and the membrane split Bacteria from Archaea.

Place it on the treespecimen 1 of 12

The specimen 1 of 12

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Nucleus —

Cell wall —

Ribosomes —

Membrane lipids —

Where it lives —

Causes human disease —

0 right0 placed

How to call itStart with the nucleus. A nucleus means Eukarya. No nucleus leaves Bacteria or Archaea, and the wall and the membrane tell those two apart. No cell at all means it gets no branch.