Think. Can the blank be filled up by using the Definition method ?
This method might be applicable if a verb to be is seen right after the blank in the sentence.
__________________ is defined as the transport of oxygen from the outside air to the cells within tissues, and the transport of carbon dioxide in the opposite direction.
Answer : Respiration
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Experiment #7 - Forces (Frictional Force)
Experiment #6 - Forces (Frictional Force)
Experiment #5 - Forces (Interactions)