The Amulet of Tizra - Ona of Ozmora

When strolling in the moonlight on the beach, Ona stumbles across a mermaid princess who has been sacrificed to a sea dragon and attempts to rescue her.  --"But what is it?" the princess wondered in amazement.   Ona watched her, silently amused to see someone so baffled by something as simple as an apple. "It's an apple, " she said.   "Awwwwwpple, " tried the princess. "And the big thing it grew from?"  "A tree."  "Treeeees.
What are they?"  "Plants."  "Do they speak?" "Sometimes."