NEET BIOLOGY

Detailed explanation-1: -Vertebrates are animals that have backbones and an endoskeleton (skeleton inside their bodies). In contrast, invertebrates are animals that do not have backbones. Invertebrates can have a skeleton outside their bodies called an exoskeleton, while some invertebrates have no skeleton at all!

Detailed explanation-2: -Instead, they have an exoskeleton which is a hard outer covering that protects their body. 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.

Detailed explanation-3: -Endoskeleton. An endoskeleton is a skeleton that consists of hard, mineralized structures located within the soft tissue of organisms. An example of a primitive endoskeletal structure is the spicules of sponges. The bones of vertebrates are composed of tissues, whereas sponges have no true tissues (Figure 19.4).

Detailed explanation-4: -Animals that have a backbone are called vertebrates. The backbone is is a column of bones that supports the body, and also protects the spinal cord. The back is made up of many separate bones, called vertebrae.