which is the smallest living creature?
370531
Amoeba are among the largest single celled organisms, far larger than any bacteria.  Some amoeba are large enough to be seen without needing a microscope!\n\nBacteria are the smallest living things and mycoplasms are the smallest living bacteria (known as nanobacteria).\n\nIf by creatures you mean animals, then the smallest depends a bit on your definition of "small".  The shortest is probably little Trichoplax adhaerens, which looks a bit like a hairy, multi-cellular amoeba.\n\nThe smallest animal in terms of number of cells is probably some kind of Mesozoa, a set of worms famous for being very short and only a few cells across, so much thinner than Tricoplax and less massive.\n\nThe smallest vertebrate is a species of fish that was just discovered recently, though I forget the name of it, sorry.  :-)\n\nIt's recently been discovered that a few single-celled organisms are, in fact, evolved from animals.  If you would count these as animals, they would be the smallest animals, though that would be merely a technicality.\n\nAll of this applies only to adult forms, of course.  We're all very very small to begin with!
38608
At first, scientists thought the atom was the smallest possible particle. Then they thought the electron, proton and neutron were the smallest. Now we have the quarks and other basic particles.\n\nAlthough they haven't discovered if quarks are made up of even smaller particles, I will guess that in a few years, scientists will discover that they are made of something smaller yet.
378169
Smallest Insect: \n\n\n\nFairyflies are tiny wasps (family Mymaridae) that are probably the smallest of all insects.   In Dicopomorpha echmepterygis, a Costa Rican species that parasitizes the eggs of other insects, the males may be no more than 0.139 mm in length.   Their tiny bodies, neatly packaged with complete digestive, reproductive, respiratory, and circulatory systems are actually smaller than a single-celled paramecium
15632
The smallest cell is a type of bacteria known as mycoplasma. Its diameter is 0.0001 mm. The smallest cell in the human body is the sperm cell.
352598
Sure they can!  \n\nYou wouldn't believe how many tiny critters live on (and in) all of the living things that we can see...\n\nFor example; In, and on, your body there are TRILLIONS of little guys that call you home. The same is basically true for all living things (plants included), and some of these guys are clearly parasitic, though luckily, most are helpful, and many are even necessary for our survival. That's right; we need them, but they don't need us!\n\nMy favorite "Wow" tidbit I give my students: There are more cells of OTHER critters within (and on) you than there are cells OF you... by a factor of 10!
993883
little green creatures
281090
Rotifers   are the only I can think of  now if it were Phylum Mollusca it could be Snails, Clams, and squids\n                                 good luck
970189
I would say Tardigrades also.  The smallest adult measured was 0.1 mm (100 micrometers).   When they are fully grown they can decrease their size a great extent when water is sparse making them much smaller than 0.1 mm, although this is a special case.
389401
An atom is the smallest unit of a chemical.\n\nA cell is the smallest unit of a living thing.\n\nFor more detailed infomration see the links.
207588
The smallest: Galapagos microplate\n\nPlate                  Area (Square Kilometers)\nGalapagos microplate       12000\nExplorer microplate       18400\nGorda microplate                69600\nRivera microplate                73000\nJuan Fernandez microplate       96000\nEaster microplate                133000\nSouth Sandwich microplate       166000\nJuan de Fuca                252000\nSolomon microplate                254000\nBismark microplate                286000\nMariana microplate                364000\nTonga microplate                962000\nBurma microplate                1110000\nFiji microplates                1144000\nScotia                         1651000\nCaroline microplate       1720000\nCocos                         2860000\nCaribbean                         3319000\nArabian                         5010900\nPhilippine                5447000\nIndian                         11920000\nNazca                         15630000\nSomali                         16667000\nSouth American                43617000\nAustralian                47152000\nAntarctic                         60916000\nAfrican                         61334000\nEurasian                         67811000\nNorth American                75888000\nPacific                         103280000
459398
Of adult animals that have a spine (i.e. the vertebrates), the smallest one, with the shortest spine would probably be a male Stout Infantfish (Schindleria brevipinguis) which can be only 6.5 mm long (head to tail) when sexually mature.  The spine of the infantfish would be a bit shorter than that, taking into account the size of its head and tail.\n\nWhether or not you count larval fish (which can be microscopic) depends on whether or not you consider them to have a complete spine.
329335
You have to consider the time from egg to death.\n\n\nSo, that's how I arrived at the answer--from animals in captivity. The longest-lived captive animal is the Giant Tortoise (177 years) and the shortest, the gastrotich (3 days).\n\n(Answered by April Holladay, science journalist, April 4, 2001)\n\nFurther Surfing:\n\nLife span, Encyclopedia Britannica\n\nFigure Caption: [© Scott Camazine, used with permission, Pennsylvania State University] A fruit fly lives about 37 days.\n\nQ: Which mammal has longest and which the shortest life span?\n\nA: If we just look at mammals, then primates are the longest lived group and man is the longest lived of the primates: 122 years (Jeanne Louise Calment, 1875 - 1997). Tiny shrews live the shortest: maybe 1 to 1.5 years. Interesting enough, among primates the bigger your brain, the longer you live. The faster you live, though, the shorter you live. Squirrel-like rodents live two or three times longer than mouse-like rodents because their rate of metabolism is slower.\n\n(Answered by April Holladay, science journalist, April 4, 2001)
1143073
2-3 mm diameter would be my guess, assuming that it is still alive. If squashed, much smaller.
173688
i havent seen one yet... but when i had my health class hey says that the smallest one can be 5 inches and the longest could be more than 10 inches
1133332
small insects/small vish
32912
b) has the smallest mass
68976
if you define a creature a living thing then it is a bacteria, viruses don't live, they use other life to reproduce.\nIf creature means visible thing crawling around, I have no idea, maybe an insect or other arthropods.