Cell

The video tutorial explains that organisms can be single-celled like bacteria or complex like humans with trillions of cells. It highlights the vast differences in cell size and function, noting that most cells are microscopic. An example of an extreme cell size is the unfertilized ostrich egg, which is the largest single cell, weighing about 1 kilogram.

Can you explain why most cells are too small to see?

What is the weight of an unfertilised ostrich egg, and why is it significant?