Life in Earth's oceans originated ________ years ago and came onto land ________ years ago.
A) 8 billion; 6 million
B) 3.5 billion; 450 million
C) 14.5 billion; 1.2 billion
D) 6 billion; 45 million
Correct Answer:
Verified
Q21: Phototrophs obtain their energy from _.
A) producers
B)
Q22: Approximately _ of energy is lost as
Q23: _ has same trophic level as an
Q24: Organisms that require access to oxygen to
Q25: As latitude decreases from the poles to
Q27: The ocean's most productive zone is the
Q28: The amount of energy available to heterotrophs
Q29: _ has the highest average net productivity.
A)
Q30: Net community productivity (NCP) _.
A) is GPP
Q31: _ is/are NOT an auxiliary energy flow.
A)
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