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NARA [144]
3 years ago
13

30 POINTS!!!!!!

Biology
2 answers:
vladimir1956 [14]3 years ago
8 0
I believe the answer is B.
satela [25.4K]3 years ago
3 0
B. The valves of the aorta and pulmonary artery close, producing the first heartbeat. Is the correct answer. Hope this helped. Have a good day! :)
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A manager wanted to test whether the amount of noise in a clothing factory affected how
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Answer:

When seeking to determine the number of shirts made by employees subjected to noise with and without the use of headphones, the dependent variable is the number of shirts made by the employee.

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