All observed stars have roughly the same amount of hydrogen in their atmospheres.Why then are hydrogen lines less prominent in O stars than they are in A stars?

Name: All observed stars have roughly the same amount of hydrogen in their atmospheres.Why then are hydrogen lines less prominent in O stars than they are in A stars?
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The Answer of All observed stars have roughly the same amount of hydrogen in their atmospheres.Why then are hydrogen lines less prominent in O stars than they are in A stars?

All Observed Stars Have Roughly the Same Amount of Hydrogen