Question

Which sentence uses a colon correctly? It can sometimes be difficult to tell lakes from rivers: both are generally made up of fresh water, and they often host the same species of fish. It can sometimes be difficult to tell lakes from rivers, both are generally: made up of fresh water, and they often host the same species of fish.

Answer 1

"It can sometimes be difficult to tell lakes from rivers: both are generally made up of fresh water, and they often host the same species of fish" would be the best option since it is indicating a strong break in speech, but really a semicolon should be used here instead since there is no list being made.