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YouTube is an American online video sharing platform owned by Google. Accessible worldwide, [note 1] it was launched on February 14, 2005, by Steve Chen, Chad Hurley, and Jawed Karim, three former employees of PayPal. Headquartered in San Bruno, California, United States, it is the second most visited website in the world, after Google Search.
A leaf ( pl.: leaves) is a principal appendage of the stem of a vascular plant, [1] usually borne laterally aboveground and specialized for photosynthesis. Leaves are collectively called foliage, as in "autumn foliage", [2] [3] while the leaves, stem, flower, and fruit collectively form the shoot system. [4]
Internet TLD. .us [16] The United States of America ( USA or U.S.A. ), commonly known as the United States ( US or U.S.) or America, is a country primarily located in North America. It is a federation of 50 states, a federal capital district ( Washington, D.C. ), and 326 Indian reservations.
Cristales de nieve observados con un microscopio electrónico de barrido y coloreados artificialmente. El microscopio (del griego μικρός micrós, ‘pequeño’, y σκοπέω scopéo, ‘mirar’) 1 es una herramienta que permite observar objetos, que son demasiado pequeños para ser observados a simple vista. El tipo más común y el ...
Törpebolygó. Ezt a szócikket át kellene olvasni, ellenőrizni a szöveg helyesírását és nyelvhelyességét, a tulajdonnevek átírását. Esetleges további megjegyzések a vitalapon. A törpebolygó a Naprendszerben keringő égitestek egyik típusa, átmenetet képez a bolygók és a kisbolygók között.
The cell is the basic structural and functional unit of all forms of life. Every cell consists of cytoplasm enclosed within a membrane; many cells contain organelles, each with a specific function. The term comes from the Latin word cellula meaning 'small room'. Most cells are only visible under a microscope.
Wikipedia ( / ˌwɪkɪˈpiːdiə / ⓘ WIK-i-PEE-dee-ə hoặc / ˌwɪkiˈpiːdiə / ⓘ WIK-ee-PEE-dee-ə) là một bách khoa toàn thư mở trực tuyến đa ngôn ngữ [4] được sáng lập và duy trì bởi một cộng đồng biên tập viên tình nguyện và chạy trên nền tảng wiki . Tính đến tháng 1 năm 2021 ...
