Answered: 10 to 1,000 solar masses. | bartleby

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_____________________ are small, dark nebulae about 1 light-year in diameter that contain 10 to 1,000 solar masses.

	a.	HI regions
	b.	HII regions
	c.	Emission nebulae
	d.	Bok globules
	e.	Reflection nebulae

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