Cell walls. This is a rigid layer made of cross-linked protein and sugars that surrounds the bacteria, holding it together and stopping it from exploding. The stain is called Gram's stain and is either purple (+ve) or pink (-ve). This distinction is used because it allows you to quickly cut the bacteria in half, and more importantly decide which antibiotic to give without actually having to grow the thing.
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It has a very high Maintenance and set up cost. The technology needed is not yet mature so alot of development is needed. Many rural farmers may loose living and become unemployed
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An abiotic factor is a non-living part of an ecosystem that shapes its environment.
In 1859, Charles Darwin set out his theory of evolution by natural selection as an explanation for adaptation and speciation. He defined natural selection as the "principle by which each slight variation [of a trait], if useful, is preserved".