Approximately, what basic composition are all stars born with? a) 98 percent hydrogen, 2 percent helium b) half hydrogen, half helium, no more than 2 percent heavier elements c) three-quarters hydrogen, one-quarter helium, no more than 2 percent heavier elements d) 90 percent hydrogen, 10 percent helium, no more than 1 percent heavier elements e) one-quarter hydrogen, three-quarters helium, no more than 2 percent heavier elements