Final answer:
Vertebrates are animals with a backbone. Filamentous structures may be common to many different kinds of vertebrates.
Step-by-step explanation:
Vertebrates are a subgroup of animals within the phylum Chordata that possess a vertebral column or spine, which is a bony or cartilaginous structure that surrounds and protects the spinal cord. Vertebrates are characterized by their well-developed internal skeleton, which includes the vertebral column, and a cranium that encloses and protects the brain. They represent a diverse group of animals and include some of the most familiar and widespread species on Earth.
Vertebrates are animals with a backbone. They include mammals, birds, reptiles, amphibians, and fish. Filamentous structures may be common to many different kinds of vertebrates.