Question

Is bacteria considered alive?

Answer 1

Bacteria are the unicellular, prokaryotic cells. They are microscopic and are not visible under the naked eye. To see a bacteria a microscope is required. They constitute a very large domain on earth. They are known to be the first life form to appear on earth.

Complete answer:
Unicellular, prokaryotic, microscopic cells are known as bacteria. They belong to the phylum Monera. They are a few micrometers in length and cannot be seen with the naked eye. They constitute a very large domain on earth. They are known to be the first life form to appear on earth.
They are found in vast diversity and are present in most of the habitats. They inhabit soil, water, hot water springs, acidic hot springs, deep biosphere and radioactive waste too. In many stages of life bacteria are very important like in the nitrogen cycle for the conversion of nitrogen to ammonia. Bacteria also help in degradation and decomposition of dead remains of plants and animals.
They also live in symbiotic relationships with plants and animals. The study of bacteria is known as bacteriology which comes under microbiology. Nearly all animals are dependent on bacteria either directly or indirectly. In humans the largest number of bacteria are present in gut and on skin. Most of the bacteria are harmless, some are helpful and very few are disease causing.
Bacteria are considered as living organisms because:
They carry out metabolism.
Ability to reproduce.
Carry out growth.
Respond to stimulus.
They adapt themselves to the environment.

Yes bacteria is considered as a living organism

Note:
Unicellular, prokaryotic, microscopic biological cells are known as bacteria. They are known to be the first life form to appear on earth. The above mentioned are the reasons why bacteria are considered as living organisms.