Please answer the following question: Answer the following question given this paragraph: Vertebrates have a system of muscles attached to the endoskeleton to enable movement. Muscles control movement by alternately contracting (shortening) and relaxing (lengthening). Generally, muscles work together in opposing pairs. Q: In vertebrates, a system of what structures attached to the endoskeleton enables movement? Choices: - nerves - tendons - tissues - muscles A:
Answer:
muscles