I think it is the last sentence but I might be wrong
The correction that should be made in order to fix the punctuation error in the given sentence above is, replace the colon after "therefore" with a comma. Therefore, the correctly punctuated sentence would be, Leeann studied all weekend; therefore, she did well on her algebra test.
The story wouldn’t have been as conflicting. if all the animals worked together they wouldn’t have had any problems to deal with
