What is the approximate chemical composition (by mass) with which all stars are born?
A. three quarters hydrogen, one quarter helium, no more than 2% heavier elements
B. half hydrogen and half helium
C. 98% hydrogen, 2% helium
D. 95% hydrogen, 4% helium, no more than 1% heavier elements
Answer:A
What is the approximate chemical composition (by mass) with which all stars are born?
A. three quarters hydrogen, one quarter helium, no more than 2% heavier elements B. half hydrogen and half helium C. 98% hydrogen, 2% helium D. 95% hydrogen, 4% helium, no more than 1% heavier elements