Why some scientists prefer using microorganisms in their bioremediation processes.?

Question

Why some scientists prefer using microorganisms in their bioremediation processes.?

Answer 1

replication is quick and easily, small life cycle... no danger of death of mo, the have one celled organism so each to practise and reserch......

Answer 2

Prefer microorganisms to what?  If you want to bioremediate, you use microorganisms or some other organism.  You can't BIOremediate with anything but organisms.  

Micro-organisms replicate quickly.  Other organisms do not.