Which animal changes its Gender to become a Female to take care of the young ones if the Female is dead

Clown fish live in hierarchical groups with a dominant female. If she dies, the dominant male undergoes protogynous sex change to become female, ensuring the group can continue breeding. This biological adaptation is well-documented in marine biology. Sharks, goldfish, and seahorses do not change from male to female in this context (seahorses actually have male pregnancy, not sex change).