Approximately what percentage of animal species are invertebrates?

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Prepare for the MTTC Integrated Science (Secondary) Test. Utilize flashcards and multiple-choice questions, each accompanied by hints and explanations. Achieve success in your exam journey!

Multiple Choice

Approximately what percentage of animal species are invertebrates?

Explanation:
Most animal species are invertebrates—organisms without a backbone. The animal kingdom includes a huge variety of invertebrates such as insects, spiders, mollusks, crustaceans, and worms, and they comprise the vast majority of described species. In fact, about 97–98% of all described animal species are invertebrates, while vertebrates (fish, amphibians, reptiles, birds, mammals) make up only a small fraction. Insects alone account for a large portion of species, driving the overall proportion toward the high 90s. So the best approximation is around 98%.

Most animal species are invertebrates—organisms without a backbone. The animal kingdom includes a huge variety of invertebrates such as insects, spiders, mollusks, crustaceans, and worms, and they comprise the vast majority of described species. In fact, about 97–98% of all described animal species are invertebrates, while vertebrates (fish, amphibians, reptiles, birds, mammals) make up only a small fraction. Insects alone account for a large portion of species, driving the overall proportion toward the high 90s. So the best approximation is around 98%.

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