A fatty acid is if it contains no carbon-carbon double bonds, if it has only one carbon-carbon double bond, and if it contains two or more carbon-carbon double bonds.

A fatty acid is saturated if it contains no carbon-carbon double bonds, monounsaturated if it has only one carbon-carbon double bond, and polyunsaturated if it contains two or more carbon-carbon double bonds.

Explanation: Fatty acids are compounds found in both plants and animals that contain long chains of carbon. The oxidation of fatty acids to acetyl CoA is a central energy-yielding pathway in animals. Fatty acids can be classified as saturated and unsaturated. A fatty acid is said to be saturated if it contains only single bonds in its carbon chain. A fatty acid is said to be unsaturated if it contains one or more double bonds in its carbon chain. An unsaturated fatty acid can be monounsaturated or polyunsaturated, when a fatty acid contains only one double bond in its carbon chain it is monounsaturated but when a fatty acid contains more than one double bond in its carbon chain, it is polyunsaturated.

mountains can affect the climate of nearby lands. in some areas, mountains block rain, so that one side of a mountain range may be rainy and the other side may be a desert. much of airborne moisture falls as rain on the windward side of mountains.

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