Over-the-counter estrogen products are available in pill form. Estrogen levels in women who are still menstruating drop after menopause. People might shop around when choosing an over-the-counter medication by comparing possible side effects.
Updated November 25, 2016. Classification is a data mining technique that assigns categories to a collection of data in order to aide in more accurate predictions and analysis. Also called sometimes called a Decision Tree, classification is one of several methods intended to make the analysis of very large data sets effective.
Taxonomic Classification How are organisms classified to the species level? A hierarchical system is used for classifying organisms to the species level. This system is called taxonomic classification. The broadest classifications are by domain and kingdom; the most specific classification is by genus and species. The hierarchical groupings in between include phylum, class, family, and order. What is a species? Species are the basic unit of classification.