Answer: Bacteria
Explanation:
Bacteria are microscopic, single celled organism that can live in normal conditions as well as it can thrive in the diverse environments.
These organism live in soil, air, water, ocean, and even inside the gut of human beings and other organism.
It can survive without host or even survive inside the host. Bacteria are useful and harmful as well.
It can help in food processing and can also cause harmful diseases. It is found everywhere and hence called as omnipresent.
