Perform the subtraction and simplify. 
Definitions:
Fraternal Twin
Twins that result from the fertilization of two different eggs by two different sperm, genetically similar as ordinary siblings.
Primary Sex Characteristics
Are the physical features that are present at birth and are directly involved in human reproduction.
Conception
The moment when a sperm fertilizes an egg, leading to the beginning of pregnancy.
Sex Hormones
Chemical substances produced by the gonads (ovaries and testes) that regulate many aspects of sexuality and reproduction as well as secondary sexual characteristics.
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