AP BIOLOGY

Detailed explanation-1: -An endoskeleton is an internal skeleton composed of hard, mineralized tissue that also enables movement by attachment to muscles. The human skeleton is an endoskeleton that is composed of the axial and appendicular skeleton.

Detailed explanation-2: -Snakes do not have an exoskeleton; they have an internal skeleton. Snakes are reptiles, and all reptiles are vertebrate animals that have backbones, which is the core component of an endoskeleton, or a skeleton on the inside of the body.

Detailed explanation-3: -Complete answer: Frogs have endoskeleton which is a hard structure like bones and protects an organism internally. Frogs belong to amphibians (cold blooded animals) and have delicate skin. Jellyfish are invertebrates which is a form of endoskeleton also known as hydrostatic skeleton.

Detailed explanation-4: -Mammals, reptiles, birds, fish and amphibians are vertebrates with endoskeletons (skeletons inside their bodies). Their skeletons provide support and protection and help them to move. Insects, spiders and shellfish are some of the invertebrates that have exoskeletons.