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Bot GPT 4-o mini It seems like you're looking for a phrase to complete the statement regarding how a nebula forms. A possible answer could be:
"gravity pulls matter together or causes nuclear fusion."
This indicates that gravity is responsible for pulling matter together to form the nebula, and nuclear fusion is the process that might occur when conditions are right, especially in the later stages of forming stars from the nebula.
If you have specific options or terms to choose from, please provide them, and I can help you select the most appropriate answer!