It is because when it is placed in a freezer, the cold slows down the chemical reaction that makes it glow. Basically, you freeze the chemicals inside the glow stick.
Hi, what are the sentenes that need to be combined?
I think it's the last one. I hope you find the right answer.
I think it would be best if you write it yourself, that way it sounds more original and you won’t have to worry about plagiarism. But that’s just my opinion. But, some of my advice would be to use a website called Grammarly, it’s super helpful for this sort of thing. :). Sorry this wasn’t the answer you wanted.
Answer:
Submit the test without making any changes.
Explanation:
The text seems fine the way it is.
hope this helped <3