Question

What is a bacteria?

Answer 1

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Bacteria are single-celled organisms. Bacteria are single-cell organisms that are neither plants nor animals. They usually measure a few micrometers in length and exist together in communities of millions. A gram of soil typically contains about 40 million bacterial cells.
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Answer 2

bacteria simply i say .. is a type of microorganisms and mostly are prokaryotic. .

Typically a few micrometres in length, bacteria have a number of shapes, ranging from spheres to rods and spirals

There are typically 40 million bacterial cells in a gram of soil and a million bacterial cells in a millilitre of fresh water. There are approximately 5×1030 bacteria on Earth

conclusion :-Bacteria are microscopic, single-celled organisms that exist in their millions, in every environment, both inside and outside other organisms.

Some bacteria are harmful, but most serve a useful purpose. They support many forms of life, both plant and animal, and they are used in industrial and medicinal processes.