Bone metastasis may be the first sign that you have cancer, or bone metastasis may occur years after cancer treatment. Bone metastasis can cause pain and broken bones. With rare exceptions, cancer that has spread to the bones can't be cured. Treatments can help reduce pain and other symptoms of bone metastases.
Medical Definition of Chondrichthyes. : a class comprising cartilaginous fishes with well-developed jaws and including the sharks, skates, rays, chimeras, and extinct related formsâcompare cyclostomata.
Chondrichthyes means cartilaginous fishses, in fact their skeleton is made up of cartilage, while osteichthyes, which means osseous fishes, have an osseous skeleton, but there are other differences: chondrychthyes have many branchial fessures, different reproduction, lack of swim bladder, and many others.