5 Questions
What is the definition of invertebrates?
Invertebrates is an umbrella term describing animals that neither develop nor retain a vertebral column, which evolved from the notochord.
What is the estimated percentage of invertebrate species in the animal kingdom?
One estimate puts the figure at 97%.
Name three well-known phyla of invertebrates mentioned in the text.
Arthropods, mollusks, annelids
What is the size range of invertebrates mentioned in the text?
Invertebrates vary widely in size, from 50 μm (0.002 in) rotifers to the 9–10 m (30–33 ft) colossal squid.
Why is the term 'invertebrates' considered polyphyletic?
Some so-called invertebrates, such as the Tunicata and Cephalochordata, are actually sister chordate subphyla to Vertebrata, being more closely related to vertebrates than to other invertebrates.
Test your knowledge of invertebrates with this engaging quiz! Explore the diverse world of animals without a vertebral column and learn about phyla such as arthropods, mollusks, annelids, echinoderms, flatworms, and cnidarians.
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