During intense exercise, the metabolic activity of muscle causes ________ in the partial pressure of oxygen in the tissue, ________ the movement of oxygen into the tissue.
A) a decrease : facilitating
B) a decrease : reducing
C) no change : facilitating
D) an increase : reducing
E) an increase : facilitating
Answer: A) a decrease : facilitating
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How do marine polychaetes use chitin hardened body parts?
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The gene that encodes small-subunit ribosomal RNA is useful for reconstructing the phylogeny of all organisms, because ________
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