Digital SAT Practice Test: Transitions (Set 4)
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Set 4: Transitions (Advanced)
1 / 10The gut microbiome—trillions of bacteria residing in our intestines—influences not only digestion but also immune function and possibly mood. Research has linked microbiome composition to conditions ranging from obesity to depression. _______ causality remains difficult to establish, as many observed correlations might reflect reverse causation or shared underlying factors.
Which choice completes the text with the most logical transition?
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