Ther is little variety among organisms found in pools, ponds, and lakes t/f

The correct answer is:  "False" .

Note:  To the contrary, there is much great among the organisms found in pools, ponds, and lakes.  

This has to due with the nature of pools / vs. ponds/ vs. lakes / including shape, size, and other defining characteristics (incl. nature of running water), sunlight, location, amount of sunlight received, amount of water throughout time, and many other factors.