این هواپیمای سه باله ی آلمانی شاید معروف ترین هواپیما در جنگ جهانی اول باشد۔
Glands of the endocrine system secrete hormones into the blood.
The reproductive system is a series of organs working together for the purpose of reproduction.
The work of smiths – one of the first professions in history – became even more important in the Middle Ages.
Medieval Venice owed its wealth to its flourishing maritime trade.
During swallowing food travels from the mouth cavity into the stomach.
NAD⁺ is a coenzyme that plays an important role mainly in catabolic processes, while NADP is important in anabolic processes as hydrogen carriers.
The cannon was an important type of firearms at the beginning of modern history, widespread both on land and water.
The Hubble Space Telescope orbits outside the distorting influence of Earth´s atmosphere.
Surface epithelia cover the external and internal surfaces of the body
The ´Flying Fortress´ was developed for the United States Army Air Force by Boeing
One of the largest marsupials.
Igloos were the typical dwellings built by Eskimos living in the Arctic zone.
The Earth's continents have been in constant motion during the history of the planet.
The water supply system provides clean and safe drinking water for the consumers.
These excellent shipbuilders and sailors travelled great distances on the seas and rivers.
The German liquid-propellant rocket, developed during WWII, was the first known man-made object to reach space.
طیف گسترده ای از دستگاه های شکنجه در سیاه چال های قرون وسطایی استفاده مي شد۔
Typical working-class districts with unhealthy living conditions were built at the time of the Industrial Revolution.
The diameter of our galaxy is about 100,000 light years; it contains more than 100 billion stars, one of which is our Sun.