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Arachnids.
Np
The smallest group an organism can be classified is a species.
micro organisms
Nanobes
Nanobes
a KingdomI'm pretty sure TAXON would also be another possibility.
Mycoplasms =) The smallest living cell is called SAR11. It also has the smallest genome. It is a bacteria group found mainly in the seas.
The smallest group of invertebrates are sponges. They live in the ocean, fresh water ,lakes. and streams. Some things attach themselves to other things so they can get food.
One group of living things that are 20 inches are cats. Another group of living things in this category would be ferrets.
A kingdom is the largest group into which living things can be classified.
The smallest living things depend on how a living thing is defined. Some biologists do not believe viruses are living organisms because there are no free living forms (all are parasitic) and because they must reply on their host for reproduction. Others believe that, despite this, they have an existence of their own separate to the host and are subject to natural selection and are therefore alive. If you accept viruses are not alive, the smallest living things would be amongst the bacteria or protists. Bacteria are single celled organisms with no cell nucleus while protists have a nucleus. Generally the bacteria are slightly smaller but their sizes overlap. If you accept that viruses are alive, the smallest group are the Parvoviruses between 18 and 26 nanometres. These are single stranded DNA viruses. 1 nm = 1/1000000000 metres or 0.000039 inches.