add a comma or semicolon if needed. otherwise, submit the text without any additional punctuation.\n\nin the…

add a comma or semicolon if needed. otherwise, submit the text without any additional punctuation.\n\nin the nineteenth century, albumen, or the clear part of the inside of an egg, was an inexpensive material used for photographic printing so commercial photographers actually kept chickens on - site.
Answer
Brief Explanations:
The two clauses "In the nineteenth century, albumen... was an inexpensive material used for photographic printing" and "so commercial photographers actually kept chickens on - site" are independent clauses. A semicolon is used to separate independent clauses when there is no coordinating conjunction like "and", "but", "or", etc. In this case, "so" is a conjunctive adverb, and a semicolon is appropriate before it.
Answer:
In the nineteenth century, albumen, or the clear part of the inside of an egg, was an inexpensive material used for photographic printing; so commercial photographers actually kept chickens on - site.