A redox reaction is a chemical reaction between two substances in which one substance is oxidized and one is reduced. The rust on this metal is an example of a redox reaction.
An endotherm is an organism that maintains a constant body temperature independent of the environment, also known as warm blooded. This dog, Milly, is an example of an endotherm.
A gymnosperm is a plant whose seeds are not enclosed in an ovary. The seeds of a gymnosperm usually develop on the surface of leaves or scales. Above is an example of both a gymnosperm leaf (pine needle) and a gymnosperm cone (pine cone).
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