👉 A protochordate is a type of eutherian vertebrate that has evolved to have two sets of chondrocytes, known as the long bone and short bone, located in different parts of the body. This arrangement allows for the development of the skeleton, which is unique among vertebrates due to the absence of appendages such as claws or teeth. The long bone is primarily responsible for supporting the weight of the organism and providing support for the muscles that drive movement. The short
