What degree do you have to have to become an orthotist?

A master's degree in orthotics and prosthetics is required to work as a prosthetist, along with a 1-year residency. During this education and training, students learn about various types of devices and get clinical experience. After completing these requirements, they can take the national certification exam.

Although i don't know what is the simulated system, starfish are predators that eat mostly  microalgae,  snails, sponges, bivalves, mussels and other small marine animals. removing starfish from any system would definitely increase this animals that they prey.