why do humans make more smaller cells than just making few larger cells ?

There are several reasons why humans and other organisms make more smaller cells instead of a few larger cells:

1. Efficiency: Smaller cells have a higher surface area to volume ratio, which allows for more efficient nutrient and waste exchange. This means that smaller cells can access nutrients and oxygen more easily, and can expel waste more efficiently.

2. Flexibility: Having smaller cells allows for greater flexibility and adaptability in response to changing environmental conditions. Smaller cells can divide more quickly and easily, allowing organisms to grow and repair tissues rapidly.

3. Specialization: Smaller cells can specialize in specific functions within the organism, leading to greater overall efficiency and complexity. Different types of cells can perform different roles, such as sensory cells, muscle cells, and immune cells.

4. Energy efficiency: Smaller cells require less energy to function compared to larger cells. This allows organisms to maintain a higher level of energy efficiency and use their resources more effectively.

Overall, the production of a greater number of smaller cells allows for a more efficient and effective functioning of the organism as a whole.