Answer:
The hyphen is used to link the two adjectives, "self" and "sealing" before a noun
Explanation:
There are many ways to use hyphens in academic English writing, but given the context of the question, the hyphen is used for a particular reason. According to purdue.edu, "Use a hyphen to join two or more words serving as a single adjective before a noun."
Please put "Brainliest" on my answer if it helped you out the most!
(Further Reading) If you're still confused, I suggest you search up the following:
- Hyphen Use Rules
