At close firing distances, gasses from a gun's muzzle can produce a star-shaped pattern around a bullet hole.
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How can antibodies "remember" a particular bacterial invader or "antigen" on that invader?

What is the cause hearing loss in human being

The large increase in atmospheric carbon dioxide in the last 50 years most likely comes from a. an increase in cellular respiration b. increased decomposition by bacteria c. an increase in the burning of fossil fuels d. an increase in photosynthesis