Their “life” therefore requires the hijacking of the biochemical activities of a living cell. Bacteria, on the other hand, are living organisms that consist of single cell that can generate energy, make its own food, move, and reproduce (typically by binary fission).
Because they do not use their own energy, some scientists do not consider them alive. This is a bit of an odd distinction though, because some bacteria rely on energy from their host, and yet they are considered alive.
Viruses can replicate only inside a host cell as they depend solely on the host machinery for producing their own copies. Hence, a virus is generally considered non-living because it is living only inside the host cell.
A fungus (plural: fungi) is a living organism that includes yeasts, moulds, mushrooms and others. Fungi have thin thread-like cells called hyphae that absorb nutrients and hold the fungus in place. Some, such as mushrooms, also have a body containing many cells.
A bacterium, though, is alive. Although it is a single cell, it can generate energy and the molecules needed to sustain itself, and it can reproduce. But what about a seed? A seed might not be considered alive.
Bacteria (/bækˈtɪəriə/ ( listen); singular bacterium, common noun bacteria) are ubiquitous, mostly free-living organisms often consisting of one biological cell. They constitute a large domain of prokaryotic microorganisms.
In answering the question, are bacteria animals or plants, we can deduce that bacteria are unique organisms and deserve their own separate classification system. Bacteria are neither animals nor plants.
Bacteria are classified into five groups according to their basic shapes: spherical (cocci), rod (bacilli), spiral (spirilla), comma (vibrios) or corkscrew (spirochaetes). They can exist as single cells, in pairs, chains or clusters.
Bacteria can be found in soil, water, plants, animals, radioactive waste, deep in the earth's crust, arctic ice and glaciers, and hot springs. There are bacteria in the stratosphere, between 6 and 30 miles up in the atmosphere, and in the ocean depths, down to 32,800 feet or 10,000 meters deep.
Some examples of non-living things include rocks, water, weather, climate, and natural events such as rockfalls or earthquakes. Living things are defined by a set of characteristics including the ability to reproduce, grow, move, breathe, adapt or respond to their environment.
It is a gel-like matrix composed of water, enzymes, nutrients, wastes, and gases and contains cell structures such as ribosomes, a chromosome, and plasmids. The cell envelope encases the cytoplasm and all its components. Unlike the eukaryotic (true) cells, bacteria do not have a membrane enclosed nucleus.
Viruses are not made out of cells, they can't keep themselves in a stable state, they don't grow, and they can't make their own energy. Even though they definitely replicate and adapt to their environment, viruses are more like androids than real living organisms.
Some scientists have argued that viruses are nonliving entities, bits of DNA and RNA shed by cellular life. They point to the fact that viruses are not able to replicate (reproduce) outside of host cells, and rely on cells' protein-building machinery to function.
Like all kinds of organisms, all bacteria need to grow and multiply to survive as a species. When sufficient food is available, bacteria multiply quickly by doubling in size and then splitting in half, to create two new cells .
Living things need food to grow, they move, respire, reproduce, excrete wastes from the body, respond to stimuli in the environment and have a definite life span. Water, sun, moon and stars do not show any of the above characteristics of living things. Hence, they are non-living things.
ARE MICROBES ANIMALS? Nope. Microbes are single-celled organisms. Animal is a name reserved for multicellular eukaryotes that are heterotrophic, so organisms that are bigger than a single cell and almost all their cells have a nucleus.