the answer is
lucia walks on the beach every morning, today she saw two turtles headed for the ocean.
comma splice
Lucia loves turtles, and she invited her friend Lena to walk with her.
correct sentence
Lena joined Lucia the next day she was hoping the turtles would appear again.
fused sentence
The girls didn’t see any turtles, but they did see a leaping dolphin.
correct sentence