Look up Dawrin's theory of evolution. Basically, fossil records show how life forms change over time through evolution.
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Answer:
Change in an organism's environment forces the organism to adapt to fit the new environment, eventually causing it to evolve into a new species. ... Organisms become isolated as a result of environmental change. The cause of isolation can be gradual, like when mountains or deserts form, or continents split apart.
Explanation:
There are a variety of eubacteria living as decomposers, heterotrophs, pathogens, and autotrophs.
