What does Mila find out about What It Means to Be Human, how does she discover this, and why does she react the way she does?

What do Family and Connection mean to Mila, and why was her dolphin family so important to her? Why was Mila able to survive a life in the sea for so long?

In Mila’s view, are humans free? Why or why not? How does Mila become trapped in the world of humans in the metaphorical sense?