Fecundity, derived from the word fecund, generally refers to the ability to reproduce. In demography, fecundity is the potential reproductive capacity of an individual or population. In biology, the definition is more equivalent to fertility, or the actual reproductive rate of an organism or population, measured by the number of gametes (eggs), seed set, or asexual propagules. This difference is because demography considers human fecundity which is often intentionally limited, while biology assumes that organisms do not limit fertility. Fecundity is under both genetic and environmental control, and is the major measure of fitness. Fecundation is another term for fertilization. Superfecundity refers to an organism's ability to store another organism's sperm (after copulation) and fertilize its own eggs from that store after a period of time, essentially making it appear as though fertilization occurred without sperm (i.e. parthenogenesis).^{[citation needed]}

Fecundity is important and well studied in the field of population ecology. Fecundity can increase or decrease in a population according to current conditions and certain regulating factors. For instance, in times of hardship for a population, such as a lack of food, juvenile and eventually adult fecundity has been shown to decrease.^{[clarification needed]}

Sarah Clarke (born February 16, 1972) is an American actress, best known for her role as Nina Myers on 24, and also for her roles as Renée Dwyer, Bella Swan's mother, in the 2008 film Twilight as well as Erin McGuire on the short-lived TV show, Trust Me.

Clarke was born in St. Louis, Missouri, the daughter of Carolyn, a homemaker, and Ernest Clarke, an engineer.

She attended John Burroughs School in St. Louis, Missouri, and Indiana University, where she studied Fine Arts and Italian. While a student at IU, Clarke became a member of the Kappa Alpha Theta sorority. She was initiated into the Beta chapter in 1990.

Clarke first became interested in acting while studying abroad during her senior year in Bologna, Italy. Upon returning to the United States, she began studying architectural photography. She received free acting lessons in return for taking photographs of a cultural arts center, and she studied acting at Circle in the Square Theatre School, Axis Theater Company, and The Willow Cabin Theatre Company.

Keith Philip Newell is a former Anglican Bishop of Tasmania. He was born on 30 January 1930 and educated at the University of Melbourne. After working as a mathematics teacher and tutor in physics he studied for ordination and became a priest in 1960. He was successively curate of St James, King Street, Sydney,Rector of Christ Church, St Lucia Brisbane, a canon residentiary of St John's Cathedral, Brisbane and finally (before his ordination to the episcopate) Archdeacon of Lilley.