The scientific study of living organisms (humans, animals and plants) from the point of view of their structure and how they function and reproduce.
Symbol denoting that a being has male reproductive organs.
Symbol denoting that a being has female reproductive organs.
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.
Symbol placed before a date denoting a person’s year of birth.