Identify the missing particle in the following equation: 
Definitions:
Fallopian Tubes
Tubes that connect the ovaries to the uterus in the female reproductive system, where fertilization of the egg by the sperm usually occurs.
Infertility
Inability to conceive a child after 12 months of sexual intercourse without the use of birth control.
Obesity
A medical condition characterized by excess body fat that presents a risk to health, typically measured by BMI (body mass index).
Fertility
The ability to conceive and bear offspring.
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