Define the word ubiquitous and provide examples showing why this is an appropriate term to use while describing microbes

They are found everywhere on the planet. Microbes are the most abundant organisms found in every region and environment on Earth.

Explanation:

Ubiquitous means present or found everywhere. Microbes, are the most abundant organisms on Earth, also called microorganisms. There are several types of microbes, usually classed as protists, protozoa, algae, bacteria, viruses, and fungi.

As integral parts of our ecosystems, they are essential in their roles as producers, consumers, and decomposers and are capable of inhabiting a wide range of climates and niches- from the hottest volcanoes, icy tundras to the deepest regions of the ocean. Microbes are also essential to macro-organisms; in humans, they aid in the digestion of food and maintain gut health. Additionally, microbes can be used in the production of food, medicine, fuel, and other biotechnological applications.

well, that's easy; the answer's c, "it reduces contamination of the water and substrate of the estuary."