Which action characterized Earth's earliest atmosphere (atmosphere I) ?
Helium and hydrogen gases escaped earth's gravity.
Increased oxygen allowed reptiles to thrive.
Heat energy was retained and water vapor condensed.
Ultraviolet light split water vapor into hydrogen and oxygen
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Describe the difference between a. a hypothesis and a theory and b. an observation and an experiment.
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This chart lists four kinds of polymers and their sources. what can be known about all four polymers, despite their differences? they come from living things. they share ionic carbon bonds. they are at least 100 monomers long. they are made of repeating subunits.
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Which action characterized Earth's earliest atmosphere (atmosphere I) ?
Helium and hydrogen gases e...
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