Oxygen acts as a final electron acceptor in respiration. Which molecule is it ultimately converted into?

a. water
b. CO2
c. ATP
d. glucose


Ans: a. water

Biology & Microbiology

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The Lake Erie ecosystem was affected by humans because human activities ____

a. extracted resources without replacement b. caused global warming c. used the water without replacement d. disrupted energy flow and the cycling of nutrients e. extracted energy without replacement

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What is a challenge that organisms living in an estuary face that other aquatic organism normally do not face?

A. changes in temperature at different depths B. daily changes in salinity C. movement of water D. light penetrating only through the photic zone E. damage from pollution

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When you eat an apple, the core left over is the ovary.

a. true b. false

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_________ occurs when two or more species live intimately together with their fates linked

Fill in the blank(s) with the appropriate word(s).

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