Final answer:
Sea squirts, or tunicates, digest their cerebral ganglion during metamorphosis, which is equivalent to the human brain. The cuticle does not molt in sea squirts.
Step-by-step explanation:
Sea squirts, also known as tunicates, undergo metamorphosis during their development. During this process, the tunicate digests its cerebral ganglion, which is the equivalent of the human brain. This has led to the saying that the sea squirt 'eats its own brain.' However, it's important to note that the cuticle of sea squirts does not molt. The cuticle is the hard outer layer in arthropods, not tunicates.