essential part for the given word from the following options respiration | Examsbook

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3706 0

Q: Essential Part for the given word from the following options. Respiration

1
Oxygen
2
Carbon monoxide
3
Mouth
4
Circulation

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Answer : 1. "Oxygen"
Explanation :
Answer: A) Oxygen Explanation: A person or animal must take in oxygen for respiration to occur. A mouth (choice a) is not essential because breathing can occur through the nose. Choices b and d are clearly not essential and can be ruled out.

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