In this task, you are given a sentence and a question, you would be asked to create the answer which is contained in the sentence provided.

Sentence: Although it is not vital to humans, calcitonin is important for calcium homeostasis in adults of some species in vertebrates group characterized by backbones. Question: Although it is not vital to humans, calcitonin is important for calcium homeostasis in adults of some species in what group characterized by backbones?
vertebrates