Question

Animals without a backbone are classified as ________.
crustaceans
invertebrates
arthropods
worms

Answer 1

One of the most basic ways of categorizing animals is to break them down into animals with backbones and animals that do not have backbones. The animals that have backbones are called vertebrates. This word comes from the word that we use for the bones that make up the backbone. Those bones are called vertebrae so the animals are vertebrates. The animals that do not have backbones are called invertebrates.

Some examples of vertebrates include human beings, cats, dogs, fish, elephants, and chickens.

Some examples of invertebrates include spiders, worms, and flies.

Answer 2

so B