Multiple choice

Vertebrates constitute approximately ____ % of the described animal species?

  1. 5

  2. 10

  3. 15

  4. 20
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A Correct answer
Explanation

Vertebrates represent only about 3-5% of all described animal species. The vast majority (95%+) are invertebrates - insects, arachnids, mollusks, crustaceans, worms, and others. This reflects the incredible diversity of invertebrate phyla compared to the relatively small vertebrate lineage.

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