What evidence supports the past existence of Pangaea?

What evidence supports the past existence of Pangaea? The rock formations of eastern North America, Western Europe, and northwestern Africa were later found to have a common origin, and they overlapped in time with the presence of Gondwanaland. Together, these discoveries supported the existence of Pangea. What type of climate do present day coal deposits […]

How are memory B cells activated?

How are memory B cells activated? T cell dependent mechanisms B cells may also be activated by binding foreign antigen in the periphery where they then move into the secondary lymphoid organs. A signal transduced by the binding of the peptide to the B cell causes the cells to migrate to the edge of the […]

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