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exis [7]
2 years ago
15

20. When the hydrogen supply in the core begins to run out, and the star is no longer generating heat by nuclear fusion, the cor

e becomes unstable and contracts. The outer shellof the star, which is still mostly hydrogen, starts to expand. At this phase the star is called a _____.
a.White dwarf
b.Red dwarf
c.Red Giant
d.Black hole
Chemistry
1 answer:
Triss [41]2 years ago
5 0

Answer:

b

Explanation:

i seached it up

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