Detailed Instructions: Given scientific fact as input, generate the question from this fact such that it can be answered from the input.
Q: Although it is not vital to humans, calcitonin is important for calcium homeostasis in adults of some species in vertebrates group characterized by backbones.
A:
Although it is not vital to humans, calcitonin is important for calcium homeostasis in adults of some species in what group characterized by backbones?