AP 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: -All vertebrates have an endoskeleton. However invertebrates can be divided again between those with an exoskeleton and those with a hydrostatic skeleton.

Detailed explanation-3: -Endoskeletons are made up of bones and cartilage and are found inside the body. Unlike exoskeletons, endoskeletons grow with us as we grow. Animals with endoskeletons, like humans, are vertebrates, which means animals that have backbones.

Detailed explanation-4: -An endoskeleton is a skeleton that consists of hard, mineralized structures located within the soft tissue of organisms.

Detailed explanation-5: -The vertebrate endoskeleton includes the axial (i.e., vertebral and rib) and appendicular (i.e., limb) skeletons, as well as some elements within the head (e.g., the braincase and ear ossicles).