biology
The scientific study of living organisms (humans, animals and plants) from the point of view of their structure and how they function and reproduce.
male 
Symbol denoting that a being has male reproductive organs.
female 
Symbol denoting that a being has female reproductive organs.
death 
Symbol placed before a date denoting a person’s year of death.
blood factor negative 
Individuals not carrying the Rh molecule (antigen) are Rh negative; the Rh factor plays an important role in pregnancy (the parents’ factors must be compatible).
blood factor positive 
Individuals are Rh positive when their red blood cells carry an Rh molecule (antigen); the Rh factor is positive in about 85% of the population.
birth 
Symbol placed before a date denoting a person’s year of birth.