What tools and materials do they need? And what are the key characteristics that define a cell? This unit answers these questions and provides a basic overview of the inner workings of the cell.

“This observation that manipulating oxygen can improve cell function is especially important because it's a simple intervention that everyone can do to make their cell model a little bit closer to ...

But that doesn’t seem to be what happened. After simple cells first appeared, there was an extraordinarily long hiatus – nearly half the lifetime of the planet – before complex ones evolved.

You can produce electricity from a cell which is made of two different metals where the metals are dipping into solutions of their own ions. A simple cell has some essential features: It is made ...