Nz=4326380 people divided by the area 103736mlz=42 people per square miles.
avs=21905140 people divided by 296909mlz=7 people mlz
Answer: By breathing out
Explanation: Breathing in oxygen and breathing out CO2.
(Cows also release CO2 by farting)
Hope this helped!
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Answer:
http://mairscience.weebly.com/uploads/5/7/8/8/57880837/8th_grade_key_2015_sol_released_test.pdf
Explanation: