About 2.0 billion years ago, complex organisms began to inhabit Earth. These complex organisms developed primarily because of —changes in atmosphere gases sunlight being absorbed by land the eruption of

About 2.0 billion years ago, complex organisms began to inhabit Earth. These complex organisms developed primarily because of —changes in atmosphere gases

sunlight being absorbed by land
the eruption of volcanoes
the impact of comets

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About 2.0 billion years ago, complex organisms began to inhabit Earth. These complex organisms developed primarily because of —changes in atmosphere gases sunlight being absorbe…

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