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Bacteria and multicellular organisms are estimated to have evolved around 3 and 3.5 billion years ago. Cyanobacteria-like organisms seem to be the first evolutions into multicellular organisms.

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The only bacterial vaccine widely used to render long-term protection is the vaccine for?

There are several vaccines to prevent bacterial infections, but not nearly as many as there are for viral infections. One widely used today is the vaccine for bacterial pneumonia which has been very effective in reducing death from this infection in the elderly. Other frequently used vaccines for bacterial diseases include those for: meningitis, cholera, salmonella, anthrax, plague, Hib, and tuberculosis.


Can living things be found in the asthenosphere?

No, living things cannot be found in the asthenosphere. The asthenosphere is a region of the Earth's mantle that consists of hot, solid rock that is capable of flowing over long periods of time. Conditions in the asthenosphere are too extreme to support life.


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What is bacterial food contamination?

Bacterial food contaminations runs a long gamut. From E.Coli, Salmonella, and many more. I found you a link that you might be interested in to get more information http://aggie-horticulture.tamu.edu/extension/poison.html


Why are Bacteria the simplest cells?

Bacteria is considered primitive because it has about the most simple structure of all living things. It isn't quite a simple as a virus (which is not considered life, but is called non-life), but it is an "independent organism" that can do all the basic things a living organism can do. And bacteria, because of its primitive structure, is though by those who subscribe to evolution as one of the earliest (most primitive) forms of life. Bacteria has been on earth a long, long time, and it is an elegantly simple living thing. That's the long and short of it. Wikipedia has an excellent post on bacteria. You'll find a link to the article below.