Multiple choice

Which of the following is the longest living organisms in the animal kingdom?

  1. Cockle

  2. Scallops

  3. Geoducks

  4. Hyolitha

  5. Fordilla
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Geoducks are the longest-living organisms in the animal kingdom. The oldest recorded specimen was 168 years old but individuals over 100 years old are rare. Scientists speculate that the geoduck's longevity is the result of low wear and tear. A geoduck sucks water containing plankton down through its long siphon, filters this for food and ejects its refuse out through a separate hole in the siphon.

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