A nitrogen oxide is 63.65% by mass nitrogen. The molecular formula could be . A nitrogen oxide is 63.65% by mass nitrogen. The molecular formula could be . N2O N2O4 NO NO2 either NO2or N2O4

Non metal is an element or substance that is not a metal metal is a solid material that is typically hard, shiny, malleable, fusible, and ductile, with good electrical and thermal conductivitymetalloid is an element (e.g., germanium or silicon) whose properties are intermediate between those of metals and solid nonmetals. they are electrical semiconductors.

The answer to your question is c. mitochondria.