In the hiearchy of taxonomy,
A DOMAIN is the most inclusive category of life, as it encompases all life
SIDENOTE
Here's a helpful mnemonic I use to remeber
Do Koalas Prefer Chocolate Or Fruit Generaly Saying
Domain Most General
Kingdom
Phylum
Class
Oder
Familla
Genus
Species Most Specific
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This helps slightly immobilize the outer surface of the membrane and make it less soluble to very small water-soluble molecules that could otherwise pass through more easily. Without cholesterol, cell membranes would be too fluid, not firm enough, and too permeable to some molecules. (www.cholesterol-and-health.com/Cholesterol-Cell-Membrane.html)
Hope this helps