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Q: Which of the following is NOT a vertebrate?
  • A. Bird
  • B. Mammal
  • C. Fish
  • D. Snail
Correct Answer: Option D - Bird, mammal and fish all are chordates. In chordata, there will be presence of notochord at any stage of their life. Snail is an invertebrate which belongs to the phylum mollusca.
D. Bird, mammal and fish all are chordates. In chordata, there will be presence of notochord at any stage of their life. Snail is an invertebrate which belongs to the phylum mollusca.

Explanations:

Bird, mammal and fish all are chordates. In chordata, there will be presence of notochord at any stage of their life. Snail is an invertebrate which belongs to the phylum mollusca.