Nitrogen gas consists of

1) two separate nitrogen atoms

2)a diatomic nitrogen atom

3)a molecule of two nitrogen atoms

4)a compound of nitrogen atoms

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When coal has reached it hardest, darkest form, it is called select one: 0 a. sub-bituminous b. lignite c. bituminous d. antrhacite next page

During the winter, this species of fox has white fur, but in the summer, it has brown fur. what environmental change may have lead to this fox's fur color? snow cover increase in sun's brightness volcanic eruption global warming