________ have an internal clock that controls the beating of our heart, and the ________ of our breathing.
A.Human being; steps | B.Humans; pace |
C.Human beings; steps | D.Man; pace |
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________ have an internal clock that controls the beating of our heart, and the ________ of our breathing.
A.Human being; steps | B.Humans; pace |
C.Human beings; steps | D.Man; pace |