Multiple choice

Which of the following is not an organism in the phylum chordata?

  1. Humans

  2. Frogs

  3. Sharks

  4. Crabs

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

Chordates are defined by specific developmental features like a notochord. Crabs are arthropods, which are invertebrates, and do not belong to the phylum Chordata.