Final answer:
Cephalopods rapidly change color through specialized cells called chromatophores and iridophores, unlike amphibians, fish, and crustaceans that typically change color slower due to hormonal influences and rely more on structural coloration.
Step-by-step explanation:
The color change of cephalopod molluscs is significantly different from that of amphibians, fish, and crustaceans due to their unique cellular mechanisms. Cephalopods have specialized pigment cells called chromatophores, which can rapidly expand or contract to change the appearance of the organism's color and pattern. Beneath these are iridophores and leucophores that reflect light, creating iridescent effects and a broader range of colors like blues and greens.
In contrast, amphibians, fish, and crustaceans typically change color through hormonal influences over a longer duration, and they often rely on structural coloration or passive reflection rather than the active and rapid color change seen in cephalopods. Moreover, cephalopods possess a more complex nervous system which allows them to control these chromatophores with an exceptional level of precision, facilitating quick camouflage and communication.