Here's why:
* Size: Human cells are incredibly small, typically measuring between 10 and 100 micrometers in diameter. This is far smaller than what the human eye can resolve.
* Resolution: The human eye has a resolution limit of about 0.1 millimeters. This means we can only see objects that are at least 0.1 millimeters apart. Individual cells are much smaller than this.
Even with a high-powered magnifying glass, you won't be able to see individual cells. You need a microscope, preferably a light microscope or an electron microscope, to visualize these tiny structures.