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Yvonna has noticed that every spring and summer she tends to lose 5 to 10 pounds and every winter she gains 5 to 10 pounds. That being said, it doesn't seem to matter what she does, she always manages to stay around the same weight other than these fluctuations. In this example, which of the following concepts offers the best explanation?
Ovulation
The phase in the menstrual cycle when a mature egg is released from the ovary, making it available for fertilization.
Fertilization
Union of sperm and ovum to produce a zygote; also called conception.
Expulsion
The act of forcing out or ejecting something or someone from a place or situation.
Menstrual Cycle
The regular natural change that occurs in the female reproductive system that makes pregnancy possible, typically lasting about one month.
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