The secondary response involves mainly memory cells, this is the response that occurs on the second entrance of a microorganism or virus that has been encountered before and dealt with by the primary response.he primary immune system is also called innate immunity or auxiliary immunity because it is unspecific and present in everyone. These include physical and chemical barriers t â¦ hat protect the body from many different microscopic organisms. --Skin (and hair) acts as a large physical barrier.
The twin towers of the World Trade Center (WTC) collapsed on September 11, 2001, as a result of being struck by jet airliners hijacked by terrorists affiliated with al-Qaeda during the September 11 attacks.
Evidence of Explosives In The Twin Tower Collapses. The evidence that the World Trade Center towers were demolished is compelling. Photographs of explosives detonating during the collapse of both the north and south towers are presented below. They are taken from two (publicly available) videos of the collapses. Each frame has been numbered by its position in the video.