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Biology, 02.11.2019 07:31 wonderland12372
Arunner is three quarters of the way through a marathon. which systems are working to maintain oxygen levels for the runner's muscles?
a. integumentary, excretory, nervous, endocrine
b. circulatory, excretory, nervous, endocrine
c. respiratory, excretory, nervous, endocrine
d. circulatory, respiratory, nervous, endocrine
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