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A vaccine is a weakened or dead form of a virus that contains the antigen of that virus.

An antigen is a protein on the surface of the virus that allows the body to identify it.

Specific T h...

Summary of solution: To find the angle between the planes, we must find the normal vector to each plane and then use the scalar product to find the angle between these two normal vectors....

It is important to emphasize there were myriad causal factors to World War Two, which began in September 1939 when Hitler invaded Poland. The collapse of the League of Nations was arguably a leading facto...

(2+3√2, 0)  and (2-3√2, 0)

Organisms do not adapt much over their lives, but in a large population there will be many different individuals. Some taller, some shorter, some may have a longer beak or a slightly different colour patt...