The process of adding hydrogen to an unsaturated fatty acid and creating a more solid fat is called

Hydrogenation

Explanation:

The process of adding hydrogen to an unsaturated fatty acid and creating a more solid fat is called: hydrogenation.  A class of compounds made from the essential fatty acids that regulate a wide range of diverse body functions such as blood pressure, blood clotting and blood cholesterol.

any abiotic or biotic factor in an ecosystem that causes a population's size to slow or decrease is a limiting factor.

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explanation: