Examlex
Frequently, several different signals or molecules are needed in order to produce an immune response by a B cell or T cell. The second signal in this process is called ________.
Germany
A country in Central Europe known for its history, culture, economic power, and significant contributions to art, science, and philosophy.
Lusitania
A British ocean liner famously sunk by a German U-boat in 1915, an event that significantly swayed public opinion in several countries against Germany during World War I.
United States
A federal republic in North America composed of 50 states, a federal district, five major self-governing territories, and various possessions.
Passenger Ship
A ship designed to carry people, as opposed to cargo, over water. These ships range from small ferries to large ocean liners.
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