Here's why:
* Cell shape is determined by function: Cells are designed to carry out specific tasks. Their shape is often adapted to optimize their function.
* Rectangular shapes are not ideal for most functions: Rectangles are not as efficient for processes like diffusion, transport, and division as other shapes like spheres, cubes, or elongated shapes.
* Examples: Plant cells can be somewhat rectangular due to the presence of a cell wall, but they are often more complex and irregular. Some epithelial cells may appear rectangular in cross-section, but they are actually more like flattened, elongated shapes.
It's important to remember that cells are complex, dynamic entities, and their shapes are not always perfectly defined.
