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- Offspring: children.
- Onset: the start of, as in “the onset of symptoms.”
- Organ: a collection of tissues joined in a structure to serve a common function; for example, the lung, stomach, liver, skin, brain, and kidney.
- Overproduction: to produce more than what is needed.
- Ovulation: release of an egg (ovum) by the ovary; this normally occurs midway through the menstrual cycle.
- Oxidative stress: caused by an imbalance between the production of reactive oxygen and a biological system's ability to deal with it.
