ANATOMY

Detailed explanation-1: -The animals that do not possess backbones are known as vertebrates. These animals are mostly soft-bodied. For example Earthworms, snails, sponges, etc.

Detailed explanation-2: -The 5 groups of vertebrates (animals that have a backbone) are fish, amphibians, reptiles, birds, and mammals. Invertebrates are animals that do not have a backbone. A spider is an invertebrate because it is an animal without a backbone.

Detailed explanation-3: -invertebrate, any animal that lacks a vertebral column, or backbone, in contrast to the cartilaginous or bony vertebrates. More than 90 percent of all living animal species are invertebrates.

Detailed explanation-4: -Invertebrates do not have backbones or internal skeletons, but some have hard coverings. Insects, spiders, worms, snails, and most ocean animals are invertebrates.

Detailed explanation-5: -So, the correct answer is ‘All vertebrates are chordates’.