Final answer:
Ecdysis (molting) in arthropods such as crustaceans has the advantage of enabling growth, morphological changes, and diversification in size.
Step-by-step explanation:
The advantage of ecdysis (molting) in arthropods such as crustaceans is that it allows for growth and change in morphology. When an arthropod molts, it sheds its hard exoskeleton and grows a larger one. This enables the arthropod to increase in size and adapt to different environments. Additionally, ecdysis allows for diversification in size and the modification of molting frequency through evolution.