Question

correct the text by inserting one comma. the author has written several books about food allergies so its safe to say shes an expert on the subject.

Explanation:

The sentence "The author has written several books about food allergies so it's safe to say she's an expert on the subject." contains two independent clauses ("The author has written several books about food allergies" and "it's safe to say she's an expert on the subject") connected by the conjunction "so". When a conjunction like "so" joins two independent clauses, a comma should be placed before the conjunction.

Answer:

The author has written several books about food allergies, so it's safe to say she's an expert on the subject.