Question

how many microorganisms are present in freshwater​

Answer 1

Explanation:

Articles

ArticlesCryptosporidium contamination of the drinking water of Milwaukee, Wisconsin with in 1993 sickened more than 400,000 people and killed 47 people. Many microorganisms are found naturally in fresh and saltwater. These include bacteria, cyanobacteria, protozoa, algae, and tiny animals such as rotifers.

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Answer 2

Answer:

There is a whole range of organisms that live in water. These organisms are the flora (plant and bacteria) and fauna found in water. They each play a role in the complex balance that governs aquatic biotopia peopled by primary producers (autotrophic) and consumers of organisms or organic molecules (heterotrophic). Conversely, their proliferation as the result of certain types of pollution can constitute an inconvenience for water users: in particular, in the presence of optimum conditions, algae and aquatic plants can generate, through photosynthesis, vast quantities of organic matter from simple nutrient elements (C, N, P), with repercussions on food chains and the quality of the water (see "Eutrophication", pollution and eutrophication).