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5 天前 · cell, in biology, the basic membrane-bound unit that contains the fundamental molecules of life and of which all living things are composed. A single cell is often a complete organism in itself, such as a bacterium or yeast. Other cells acquire specialized functions as they mature. These cells cooperate with other specialized cells and become ...
- A cell is a mass of cytoplasm that is bound externally by a cell membrane. Usually microscopic in size, cells are the smallest structural units of...
- Cell theory states that the cell is the fundamental structural and functional unit of living matter. In 1839 German physiologist Theodor Schwann an...
- The cell membrane surrounds every living cell and delimits the cell from the surrounding environment. It serves as a barrier to keep the contents o...
1 天前 · English language is a West Germanic language that originated in England and spread to many parts of the world. It is the dominant language of several countries and the most widely used lingua franca. Learn about its history, development, characteristics, and varieties from Britannica, the online encyclopedia that covers a wide range of topics and personalities.
3 天前 · These writers have argued that merely attempting to balance social, economic, and environmental policymaking—the three “pillars” of sustainable development—is an inherently positive practice. Even if an imbalance of results is to a certain extent inevitable, it is better that policymakers at least attempt to achieve a balance.
14 小時前 · Israel-Hamas War, war between Israel and Palestinian militants, especially Hamas and the Palestinian Islamic Jihad (PIJ), that began on October 7, 2023, when Hamas launched a land, sea, and air assault on Israel from the Gaza Strip.
3 天前 · When does the Eiffel Tower sparkle? Eiffel Tower, Paris. Eiffel Tower, wrought-iron structure in Paris that is among the most famous landmarks in the world. It is also a technological masterpiece in building-construction history. It was designed and built (1887–89) by Gustave Eiffel and named in his honor. Quick facts. Designer: Gustave Eiffel.
1 天前 · Henry VIII (born June 28, 1491, Greenwich, near London, England—died January 28, 1547, London) was the king of England (1509–47) who presided over the beginnings of the English Renaissance and the English Reformation. His six wives were, successively, Catherine of Aragon (the mother of the future queen Mary I ), Anne Boleyn (the mother of ...
1 天前 · Marjorie Taylor Greene (born May 27, 1974, Milledgeville, Georgia, U.S.) is an American Republican politician and member of the U.S. House of Representatives (2021– ).
