Skeletal System

Arthopods- The Arthopods skele

ton is a exoskeleton, the skeleton is teathered to the body by compact hardened protein at keypoint on the creatures integumentary layer. These keypoints work as joints, allowing the arthopod to be able to move. Living organisms are able to produce minerals that can stiffen the skeleton, this process is called Biomineralization.

Amphibians- The Amphibians skeleton is a Unossified, or flexible, skeleton. These kinds of skeletons have a vertical spinal cord and other

types of limbs. All Amphibians have pedicellate teeth. Frog like Amphibians have a stiff skeleton meant for jumping and swimming, these types of Amphibians also have long hind limbs, redeuced tails, and short forelimbs.

Mollusks- These simple creatures have simple vertebraes. Molluscs typically have a type of shell on them (except octopus's). These shells are composed of proteins and chitin and are reinforced with calcium. the shells are both stiff and ossified.

Echinoderms- The echinoderms have an endoskeleton. These skeletons are connected together by calcium carbonate plates. Their spines are used for osmosis, they transport water across their endoskeleton until they reach equilibruim. The skeleton is enclosed by the epidermis.

Reptiles- Reptiles have a basic axial skeleton with a vertical vertibrael column. they also have bilateral symmetry, which means their skeleton is mirrored from side to side. The scales on their skin forms a waterproof layer, making them less prone to dehydration, and more protected from damage. Reptiles teeth are attatched to bone and are replaced many times in a lifespan.

Mammals- Humans are complied of 206 different bones. Humans consist 2 division, Axial and Apprendiculor. The axial division runs along the spine and consists of 80 bones, suh as skull, ribs, and spine.

Annelids- annelids typically dont have skelatol systems