insert one dash where needed. salmon hatch in freshwater and migrate to the ocean though they eventually…

insert one dash where needed. salmon hatch in freshwater and migrate to the ocean though they eventually return to freshwater to spawn and die.

insert one dash where needed. salmon hatch in freshwater and migrate to the ocean though they eventually return to freshwater to spawn and die.

Answer

Brief Explanations:

The dash should be inserted to create a break for emphasis or to set off a parenthetical - like thought. In this case, "though" indicates a contrast, and a dash can be used to set off the clause starting with "though".

Answer:

Salmon hatch in freshwater and migrate to the ocean - though they eventually return to freshwater to spawn and die.