Explain why the probability of a human giving birth to a male baby is always 50%

Because you cant have like 25% of probability since their is 2 genders you can have , their is either a girl or a boy so then you could not have less or more probability of having a gender you can only have one gender so you can only have 50% chance =) - Maritza Estrada

Answerincreases;

Aristotle thought so every portion of the earth tends toward the center until by compression and convergence they form a sphere. travelers going south see southern constellations rise higher above the horizon.~ hope this !