Final answer:
Marine neurons are involved in thought, perception, movement, and memory formation, but they do not help with the secretion of fumarase for digestion.
Step-by-step explanation:
Marine neurons help facilitate a range of processes such as thought, perception, movement, and the formation of memories. They do not, however, help with the secretion of fumarase for chemical digestion in the gastrointestinal system, which is the incorrect option from the selections provided. Marine animals, much like humans, have specialized neurons that enable them to react to their environment, learn, and adapt. However, their role does not extend to digestive functions like the secretion of fumarase, which is an enzyme involved in the Krebs cycle within mitochondria and not directly related to neural functions.