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Question
The process by which an organism take in oxygen and give out carbon dioxide is called _______ .
Options:
A .  excretion
B .  breathing
C .  reproduction
D .  digestion
Answer: Option B
:
B
The process by which an organism takes in oxygen and gives out carbon dioxide is called breathing. Breathing is the physical part of the process known as respiration. It is through respiration that we obtain energy.

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