The answer would be A: its container.
Gas will expand to fill whatever container it is put in.
Oxygen has six valence (outer-shell) electrons so therefore gains two more electrons to form the O-2 ion Its electron configuration is: 1s2 2s2 2p6 or Ne
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Resistance of a material being scratched in known as: Hardness
Answer:
Plants are found in the domain of eukarya
