Viruses cause a number of diseases in eukaryotes. In humans, smallpox, the common cold, chickenpox, influenza, shingles, herpes, polio, rabies, Ebola, hanta fever, and AIDS are examples of viral diseases.Even some types of cancer -- though definitely not all -- have been linked to viruses.n humans, smallpox, the common cold, chickenpox, influenza, shingles, herpes, polio, rabies, Ebola, hanta fever, and AIDS are examples of viral diseases. Even some types of cancer -- though definitely not all -- have been linked to viruses.
Map of the fortifications. Located in Canada, the Ramparts of Quebec City are the only remaining fortified city walls in North America north of Mexico. The British began refortifying the existing walls, after they took Quebec City from the French in the Battle of the Plains of Abraham in 1759.
An inner courtyard of a castle, sometimes called a Basilica. Bailey. Fortifications, usually consisting of walls and small towers built in front of a gatehouse to provide additional protection to the gateway. Some barbicans were just towers or walls built at a right angle to the Gatehouse.Barbican. An inner courtyard of a castle, sometimes called a Bailey.Basilica. A section at the base of a castle wall that is angled in such a manner to make dropped stones bounced away from the curtain wall and into the enemy. The batters also add strength to the base of the wall walk.n inner courtyard of a castle, sometimes called a Bailey. Basilica. A section at the base of a castle wall that is angled in such a manner to make dropped stones bounced away from the curtain wall and into the enemy. The batters also add strength to the base of the wall walk.