During photosynthesis, plants take in carbon dioxide and release oxygen. During respiration, animals take in oxygen and release carbon dioxide. This is a cycle because:

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atomic mass = 39

number of neutrons = 20

number of protons= 19

electronic configuration = 1s2 2s2 2p6 3s2 3p6 4s1

the number of electron in first shell = 2

number of electrons in n=3 shell = 8

air

in a tire you fill a tire with air

then a couple days later you check the air pressure in the tire

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