Biology — Dichotomous Key: Microorganisms

digraph MicrobeKey {
  rankdir=TB;
  node [shape=box, style=rounded];
  Q1 [label="Cellular?"];
  Q2 [label="Has a nucleus?"];
  Q3 [label="Photosynthetic?"];
  Viruses; Bacteria; Algae; Protozoa; Fungi2 [label="Fungi / yeasts"];
  Q1 -> Q2 [label="yes"];
  Q1 -> Viruses [label="no"];
  Q2 -> Q3 [label="yes (eukaryote)"];
  Q2 -> Bacteria [label="no (prokaryote)"];
  Q3 -> Algae [label="yes"];
  Q3 -> Protozoa [label="no, motile"];
}