Has this also been happening just accidentally?

Question

From the beginning of creation till today, the birth of boys and girls has; continuously been taking place in such proportion that- at no time it has so happened that in some human population only males or only females might have been born, and there might be no possibility of the continuation of human race.

Has this also been happening just accidentally?

Answer 1

No. This is what we call probability. Take a statistics course.

Answer 2

Take a high school biology course. Oh, and if in any ancient society the sexes became so uneven that it died out, we wouldn't have any way of knowing about it, would we.