1.

S1: We and all other animals breathe in and breathe out air all the time.P: If we stop breathing, we die.Q: It is because of this fact that we are able to live.R: It is called the atmosphere.S: All parts of the earth are surrounded by air.S6: It is a part of the earth.The Proper sequence should be:

A. QRS
B. RQS
C. PSR
D. RQP
Answer» D. RQP


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