02 January 2007

Today we started our unit on bacteria and viruses. We often think of humans as the top of the food chain, however, if there were one group of organisms that could claim that prize it would be these microscopic marvels. Despite the bad reputation, most bacteria are very helpful - giving us certain foods, digesting what we eat, cleaning up toxic spills, and returning nutrients to our soil. (Above: Salmonella attacking human cells)

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