OBJECTIVE: To demonstrate the analytical value of a cubic parameterization of the age curve of fertility and to explore its features. especially its usefulness in separating fertility level and fertility timing. METHODS: Using mathematical analysis. the cubic fertility curve is derived and examined in both continuous and discrete forms. https://www.soiebiologique.com/limited-price-Test-Evaluation-Command-ACU-Patch-Foliage-Green-flash-choice/