Why do organisms have different niches?​

Exactly the same problem i.e deficiency of nutrients and wifi network

Explanation:

The strength of the signal depends on several factors out of which the number of WI -Fi users is a prominent factor. When the number of users increases the quality of signal strength reduces. Likewise, when a cell grows too large, additional nutrient supply is required to feed the cell and its organelles. In case if the cell fails to do so, it will face the problem of nutrient deficiency and all its organelles will not receive sufficient energy thereby lowering the performance of the cell