How many atoms of nitrogen are in a chemical formula Ni(NO3)2?
O 3
O 2
O 1
O 6

The intervention of extraterrestrials has been used to explain the bermuda triangle, a region of the atlantic ocean where ships and planes are frequently lost, leaving no evidence behind. how would this explanation best be characterized?

What's the waste product of electrons and pyruvate combining in fermentation?  

The earths core is made up mainly of what 2 substances? 2. like an egg, earth has a core, a layer surrounding the core, and a thin, hard outer layer. which layers of the earth match the layers of an egg?