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IB Biology Exam Prep

Category - Biology

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Which of the following organisms is classified in the phylum Chordata?

Crab
Dolphin
Sea urchin
Squid
Octopus

Explanation

Answer: B, Dolphin. Dolphins are members of the phylum Chordata, who are characterized by having a notochord, a hollow dorsal nerve cord, and a post-anal tail.

Key Takeaway: Most chordates have are vertebrates, including humans. Crabs are arthropods, which are invertebrates with a hard exoskeleton. The octopus and squid are both types of mollusks, and the sea urchin is a type of echinoderm.

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