All of the statements above
except "most only thrive in narrow range of environments," is true
for the eubacteria. They are organisms that can be found in every habitat on
Earth. Some of these bacteria are responsible for the diseases that we contract
but they also play a large role in the Earth's ecosystems as decomposers and
heterotrophs. They have genetic structures that help them thrive and survive in
extreme environments.
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Population bottlenecks. but their genes still carry the marks of this bottleneck: they have much less genetic variation than a population of southern elephant seals that was not so intensely hunted.
