Each tonsil consists of a network of crypts (pits) that store cells used to fight infection. The tonsils contain B cells, a type of white blood cell that fights infections. They also produce antibodies against polio, streptococcal pneumonia, influenza, and numerous other infections.
Global Warming: What's Up With The Weather? is a DVD presentation of the television special by NOVA and Frontline dealing with questions raised about modern climate change.
Introduction â¢ Weather is the state of the atmosphere at a given time andplace. â¢ Climate represents average weather conditions for a placeover a long time period (years). Weather represents the state of the atmosphere at a given timeand place. Characterizing weather requires that we measureconditions such as temperature, precipitation, air pressure,wind speed and direction, humidity.