Which of the following statements about various stages of core nuclear burning (hydrogen, helium, carbon, and so on) in a high-mass star is not true?
A) Each successive stage creates an element with a higher atomic number and atomic mass number.
B) As each stage ends, the reactions that occurred in previous stages continue in shells around the core.
C) Each successive stage lasts for approximately the same amount of time.
D) As each stage ends, the core shrinks and heats further.
Question 2
Carbon fusion occur in high-mass stars but not in low-mass stars because ________.
A) carbon fusion can occur only in the stars known as carbon stars
B) the cores of low-mass stars never contain significant amounts of carbon
C) only high-mass stars do fusion by the CNO cycle
D) the cores of low-mass stars never get hot enough for carbon fusion
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