Multiple choice

Which one of the following shows a taxonomically closely-related group?

  1. Earthworm, ringworm, tapeworm

  2. Silverfish, cuttlefish, starfish

  3. Housefly, dragonfly, butterfly

  4. Sea horse, sea anemone, sea urchin

Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Housefly, dragonfly, and butterfly are all insects belonging to the phylum Arthropoda and class Insecta. The other options mix different phyla or classes - 'worms' include annelids and platyhelminthes, 'fish' mix fish, molluscs, and echinoderms, and the sea creatures represent three different phyla.