Examlex
The co-efficient of relatedness 'r' between 1st cousins is:
Spermarche
The beginning of sperm production in boys, marking the onset of puberty.
Primary Sex Characteristic
The physical features, including genitalia, that are present at birth and involved in reproduction.
Lifespan
Pertains to the length of time an individual lives, from birth to death.
Senescence
The natural physical decline brought about by increasing age.
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