Why Are Worms Invertebrate?


5 Answers

Arun Raj Profile
Arun Raj answered
Before we learn about worms, let us first understand what the term "invertebrate" means. An invertebrate is any animal that lacks a vertebral column or backbone. Invertebrates can include organisms like protozoans, echinoderms, nematodes, mollusks, cnidarians, annelids, flatworms and arthropods. About 92 percent of living animals in this planet are invertebrates. Invertebrates are usually soft-bodied and have an external skeleton for protection.

Worms are thousands of species of various invertebrate animals or insects that have a soft, slender, elongated body without appendages. The major phyla are flatworms (Platyhelminthes), annelids (Acanthocephala), ribbon worms (Nemertea) and nematodes (Aschelminthes). Worms can be as minute as microscopic or as long as 100 feet, as in the case of some ribbon worms. Worms are found to habituate on land as well as in water. They can be either living freely or harbouring a parasitic form of existence. They form a crucial link in the food chain in the eco-system.
Anonymous Profile
Anonymous answered
They have no spine.
doctor C Profile
doctor C answered
Because they are a species that was born without a backbone,therefore they are like so many other creatures an invertebrate
Anonymous Profile
Anonymous answered
Because they have no back bone. There skeleton has no bone made of internal bone.

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