released into the environment from natural geologic seeps on the sea floor. [ ] environmental effects oiled birds the lighter fractions of oil, such as benzene and toluene , are highly toxic, but they are also volatile and evaporate quickly. heavier components of crude oil, such as polynuclear aromatic...
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may alter their methods and change ingredient sources to meet emerging preferences, needs, and economics. for example, consider the transformation seen over the last thirty years with regard to the cheese enzyme, rennet, (once an almost exclusively animal-derived substance to a now largely microbially...