Misc: Where in the human body is the round window?

Questions

Ascorbic acid & sodium ascorbate are the most common forms of which vitamin?

gin, blue curacao & lemonade make a _______?

Ken Thompson & Dennis Ritchie, colleagues at Bell labs, teamed up & wrote the second version of which operating system?

Nuclear membrane, cytoplasm, & nucleus are parts of a ______?

US Captials Idaho?