A cell is a chemical factory a hundredth of a millimetre across, and it runs itself. Click any part to find out what it does — and switch between animal and plant to see which parts a plant needs that you do not.
Every cell in your body came from another cell splitting in two, and the copy has to be exact — all 46 chromosomes, no more, no less. Scrub through the process, or let it run.
Each step along this line is ten times bigger than the one before it. A typical animal cell is about a hundred times wider than a flu virus, and about a hundred times narrower than a full stop.