Examlex
The perceived source or cause (internal or external) of events in a person's life is known as his or her
Estrogens
A group of steroid hormones that promote the development and maintenance of female characteristics of the body.
23rd Chromosome
One of the pair of chromosomes responsible for determining the sex of an individual, with XX typically denoting female and XY typically denoting male.
Sex Chromosomes
The chromosomes (X and Y) responsible for determining the biological sex of an organism.
Spermarche
The beginning of development of sperm in boys’ testicles at puberty, marking the onset of adolescent fertility.
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