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They can vary in size and have been found worldwide. Pockmarks were discovered off the coasts of Nova Scotia, Canada in the late 1960s by Lew King and Brian McLean of the Bedford Institute of Oceanography, using a new side scan sonar developed in the late 1960s by Kelvin Hughes. Before the two researchers King and McLean used the side scan ...
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After five to seven days, the larvae drop and move away from the food source to pupate. The larvae burrow into the first layer of topsoil, beneath leaves or garbage, and begin their pupation. The pupa is a dark brown color. This stage can last from seven days at a warm temperature to as long as two months if the weather is much colder.
The 1520s smallpox epidemic spread from Mesoamerica into adjacent maize-growing regions in North America.A population decline in the Columbia Basin, evidenced archaeologically by a sharp regional decline in artifacts and structures in the early 1500s, has been tentatively linked to a spread of this outbreak, but greatly predates any written record in the region.
Smallpox was an infectious disease caused by variola virus (often called smallpox virus), which belongs to the genus Orthopoxvirus. [7] [11] The last naturally occurring case was diagnosed in October 1977, and the World Health Organization (WHO) certified the global eradication of the disease in 1980, [10] making smallpox the only human disease to have been eradicated to date.
The first visible sign of a beech scale insect infestation is a woolly, white, waxy covering that the insect secretes. This sign can be observed covering small areas or most of the tree. The amount of waxy material observed depends on the population of the beech scale insect on that tree. The Neonectria fungi also show signs of its presence. An ...
Acne (/ˈækni/ ACK-nee), also known as acne vulgaris, is a long-term skin condition that occurs when dead skin cells and oil from the skin clog hair follicles. [10] Typical features of the condition include blackheads or whiteheads, pimples, oily skin, and possible scarring.
Chickenpox, also known as varicella (/ ˌ v ɛ r ə ˈ s ɛ l ə / VER-ə-SEL-ə), is a highly contagious disease caused by varicella zoster virus (VZV), a member of the herpesvirus family.