Pick the odd one out

Correct answer: D. Psilotum

  • A. Psilophyton
  • B. Rhynia
  • C. Cooksonia
  • D. Psilotum

Explanation

Psilophyton, Rhynia and Cooksonia are extinct early vascular plants known mainly from fossils, whereas Psilotum is a living whisk-fern genus. The likely mistake is choosing Cooksonia because it is less familiar, although it belongs to the same early fossil group as the other two.

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