The amount of energy in the universe is believed to be the same as it was billions of years ago.
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Q67: Acids and bases are highly reactive; therefore,
Q68: Outline the path of a carbon atom
Q69: Water molecules readily dissolve ionic substances such
Q70: Energy enters a system as sunlight and
Q71: Phosphorus cycles through the Earth's ecosystems:
A) Extremely
Q73: Approximately one-half of the energy available in
Q74: Omnivores eat mainly:
A) Detritivores
B) Plants
C) Animals
D) Dead
Q75: Which of the following does not cycle
Q76: Using examples, compare and contrast the cycling
Q77: Which of the following statements is false?
A)
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