A biological key, which is sometimes called a dichotomous key, is a tool used to determine the identity of an organism by answering a series of questions about the organism’s characteristics. Dichotomous keys usually inc... More »

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A biological key, also known as an identification key or a dichotomous key, is a way to classify organisms by giving the classifier two options in each stage until identification occurs. For example, in order to identify... More »

Free biology worksheets and answer keys are available from the Kids Know It Network and The Biology Corner, as of 2015. Help Teaching offers a selection of free biology worksheets and a selection that is exclusive to sub... More »

A dichotomous key is a series of questions about an organism. The questions are presented in pairs and organized in a way that answering them results in the correct identification of the organism. One example of a dichot... More »

The universal ancestor likely would have been an aquatic organism that had a permeable membrane, distinct organelles and was able to process energy from light. It is thought to have contained the original genetic code fo... More »

A multicelled, or multicellular, organism is any living being comprised of more than one cell. Typically, multicellular life differentiates cells into specialized tasks, which in larger organisms can form tissues and org... More »

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A heterotroph is any organism, including carnivores, omnivores and herbivores, that cannot produce its own food through solar energy and must feed off another life form. In the food chain, heterotrophs represent the cons... More »