Some types of pollution are hard to
control because they are a global
problem. This mean...
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What were the main components of earth’s earliest atmosphere? oxygen and ammonia hydrogen and helium oxygen and nitrogen hydrogen and nitrogen
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Which of the following is an eon in the time scale? phanerozoic proterozoic archean all of the above
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Substances that can pass through cell membranes by diffusion include a. na ions. b. proteins c. glucose. d. oxygen.
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