Biology · Animal Physiology

With reference to how squids change colour or turn transparent on demand, consider the following statements: I. Iridophores are specialized skin cells in squids that reflect light to display structural colors or enable transparency. II. The internal structure of iridophores consists of proteinaceous platelets whose spacing and hydration alter their refractive index. III. Bio-inspired engineering has recently succeeded in replicating dynamic squid iridophore mechanisms using artificial biomimetic materials. How many of the above statements are correct?