The place on the H–R diagram where contracting protostars first become visible is a. the horizontal branch. b. the instability strip. c. the birth line. d. the zero-age main sequence. e. none of the above.
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| a. |
the horizontal branch.
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| b. |
the instability strip.
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| c. |
the birth line.
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| d. |
the zero-age main sequence.
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| e. |
none of the above.
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