Gender refers to the socially constructed features of women and men such as norms, roles, and connections of and between groups of women and men.

A specific biological attribute is referred to as a biological trait (sometimes called a character). Males and females have various biological and physiological traits, such as reproductive organs, chromosomes, hormones.

• Birth, often known as parturition in technical contexts, is the act or process of bearing or bringing forth progeny. The hormones that induce the muscular walls of the uterus to contract in mammals start the process, expelling the fetus at a stage of development when it is ready to breathe and eat.
• Childhood is the period of a child's life when the student's memory consciousness develops. Children are thought to be 6 to 12 years old during this time, when they are keen to learn new things. It is the stage of development during which the child's personality and character are rapidly developing.

Example:

1. In contemporary culture, biological sex and gender are frequently confused. Females, who have ovaries and create eggs, are distinguished from men, who have testes and generate sperm. Mammals normally have XX chromosomes for females and XY chromosomes for males. The presence of two separate sex chromosomes in the zygote, or fertilized egg, is the source of all sex differences.
2. Having brown eyes is a biological trait, just as eye color is a biological trait. Both inherited and learned biological features are possible.