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The gases cast off by a dying star are called A. dark matter. B. neutron clouds. C. planetary nebulae. D. remnants.

User Hansolo
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Answer:C. Planetary nebulae

Step-by-step explanation:

“ Planetary nebula, any of a class of bright nebulae that are expanding shells of luminous gas expelled by dying stars.”

User Frank Buss
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C. Planetary nebulae
User James Mchugh
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