what are the three main reasons that bacteria or monerans can be good?

Question

some reasons are that it decays dead bodies and clean up oil spills.

Answer 1

Bacteria are an essential part of the ecosystems; without them, most higher life forms would not be able to function.

* Decomposing. Bacteria are the best decomposers. They can break down almost anything that occurs naturally, as well as certain things that don't.

* Symbiotic relationships. Multicellular organisms, like humans, rely on whole communities of bacteria to do all sorts of things. For example, our digestive system uses bacteria to help break down various nutrients. Our skin has bacteria that help prevent infection by fungi and other parasites. There are some theories even that certain organelles (little organs in each cell) originated as bacteria--for example, mitochondria, without which multicellular organisms could not function. Some bacteria can operate in an anaerobic environment (where there is no oxygen), and thus they play unique roles in the ecosystem--such as nitrogen fixing: no other life forms can take nitrogen from the air and put it into a form that can be used by other life forms. For example, locust and alder trees have these bacteria in their roots and that's why they can grow on nitrogen-poor soil.

* Bacteria can be used to manufacture products, including things that we eat, like yogurt, or like you pointed out, to clean up various things in the environment. They can be used for biological control of pests in agriculture. They are also the cornerstone of scientific research in genetics; because they are simpler than other life forms, they are easier to study and manipulate.

I hope this helps.

Answer 2

Decomposing dead organic matter and wastes - puts nutrients back into the ecosystem to be taken up by plants.
Nitrogen-fixing bacteria take nitrogen from the air and put it into the ground in a form to be used by plants.
Cyanobacteria carry on photosynthesis and put oxygen into the air as a result.
We use some bacteria to make antibiotics.
We also genetically engineer some bacteria to produce chemicals for us.

Answer 3

bacteria helps your intestines