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Answer:
electron, carbon, protein, mitochondria, neurons, mass of neuron, nervous system, brain, man
B is correct. Krypton is a noble gas which has a full outer shell of 8 electrons and is generally unreactive because of it.
Nitrogen is special because it is necessary for growth and reproduction. It's needed for plants and animals to survive. The main function for the atmosphere i believe is to give oxygen and nitrogen.
