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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Arunner is three quarters of the way through a marathon. which systems are working to maintain oxyge...