The usually underground organ that lacks buds or leaves or nodes; absorbs water and mineral salts; usually it anchors the plant to the ground.

A number that when multiplied by itself some number of times equals a given number.

A simple form inferred as the common basis from which related words in several languages can be derived by linguistic processes.

In a hierarchy of items, the one item from which all other items are descended. The root item has nothing above it in the hierarchy. 


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