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- DictionaryIr·re·place·a·ble/ˌi(r)rəˈplāsəb(ə)l/
adjective
- 1. impossible to replace if lost or damaged: "do not send valuable or irreplaceable photographs"
20 hours ago · Although the term "lipid" is sometimes used as a synonym for fats, fats are a subgroup of lipids called triglycerides. Lipids also encompass molecules such as fatty acids and their derivatives (including tri-, di-, monoglycerides, and phospholipids), as well as other sterol-containing metabolites such as cholesterol.
20 hours ago · The history of libraries began with the first efforts to organize collections of documents.Topics of interest include accessibility of the collection, acquisition of materials, arrangement and finding tools, the book trade, the influence of the physical properties of the different writing materials, language distribution, role in education, rates of literacy, budgets, staffing, libraries for ...
