Follow the link for more information. A microorganism, or microbe, is a microscopic organism, which may exist in its single-celled form or 3w clinic water sleeping pack a colony of cells.
The possible existence of unseen microbial life was suspected from ancient times, such as in Jain scriptures from 6th century BC India and the 1st century BC book On Agriculture by Marcus Terentius Varro. Microorganisms include all unicellular organisms and so are extremely diverse. Of the three domains of life identified by Carl Woese, all of the Archaea and Bacteria are microorganisms. They live in almost every habitat from the poles to the equator, deserts, geysers, rocks and the deep sea. Antonie van Leeuwenhoek was the first to study microorganisms, using simple microscopes of his own design. Lazzaro Spallanzani showed that boiling a broth stopped it from decaying. The possible existence of microorganisms was discussed for many centuries before their discovery in the 17th century.
The existence of unseen microbial life was postulated by Jainism. In the 6th century BC, Mahavira asserted the existence of unseen microbiological creatures living in earth, water, air and fire. Avicenna suggested that tuberculosis and other diseases might be contagious. It is incorrect to assume that diseases appear one by one in humans. Disease infects by spreading from one person to another. This infection occurs through seeds that are so small they cannot be seen but are alive.