Compare sex between a boy and a girl?

Sex refers to the biological characteristics that define individuals as male or female. In terms of anatomy, males typically have XY chromosomes, testes, and produce sperm, while females generally have XX chromosomes, ovaries, and produce eggs. Additionally, secondary sexual characteristics such as body hair distribution and voice pitch differ between males and females due to hormonal influences. It is important to note that sex is distinct from gender, which is a social construct related to identity and expression.