Which element cycles through both photosynthesis and respiration? a magnesium b nitrogen c oxygen or d sodium

Chicken pox and hepatitis are bacterial diseases. true or false?

What is the correct order of cell division? include what happens in each phase

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?