I think its pulmonary circulation too.
A tornado is a violently rotating column of air extending from the base of a thunderstorm to the ground, often made visible by a condensation funnel. The formation of tornadoes<span> is complicated. So the answer would be A
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Answer:
A good experiment must include all possible causal factors in one experimental group.
Explanation:
i cant tell if thats a choice but if not then none of the above i guess