Question

Why can't single cells grow very large?Or big organisms like human beings are multicellular?Why can't such big organisms be a single large cell?

Answer 1

Answer:

As the size of cell grows larger, the Surface Area to Volume (SA/V) ratio decreases, it means raw material required for the cell to survive will not be sufficient. Thus, SA/V ratio limits the size of the cell. Therefore big organisms like human beings are mulch-cellular.

Explanation:

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Answer 2

Answer:

This is due to the surface area of a human body and a human body can't be able to survive on a single cell as each cell has its on work.