Multiple choice

Find the odd one out.

  1. Unio

  2. Chiton

  3. Echinus

  4. Pila
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Unio, Chiton, and Pila are all molluscs. Echinus (sea urchin) belongs to the phylum Echinodermata, making it the odd one out.

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