what are the advantages of a one celled organism?
823654
rapid reproduction time can allow for fast adaptation/high mutation rates\nno problems with internal transport of nutrients, diffusion/osmosis sufficient\nnot problem with breathing, no need for a lot of specialized organs. All reducing the possibilities for a lot of diseases (less complicated, less can go wrong). Cancer is not going to be a problem, ever. \nreproduction by simple cell division viable option (no complicated sex life  -does s/he really love me - confusing the critter)\nrequire comparatively less energy, not just because of small size, but also because they don't need to expend energy on coordinating and maintaining all those extra organ systems - like we expend a lot of energy just to keep our brain going, whether we use it or not. \ndon't need much space, the earth can support more bacteria than humans...\nthere are obviously also disadvantages, otherwise we all would be unicellular.
855946
1)  By producing heat, organisms can stay active throughout the cold winter months, thereby allowing them to breed and claim new habitats.  They can also feed on the slower, cold-blooded creatures!\n\n2)  Warm-blooded animals can stay more active during night time hours - an advantage for many of the same reasons in (1).\n\n3)  Warm-blooded animals can change their metabolisms much faster than can cold-blooded animals.  This allows them to adapt to environments and to increase their range.  Cold-blooded animals are much slower to adapt to changing environmental conditions.\n\n4)  Exothermic reactions within the body allow for greater metabolic efficiency.  Therefore, warm-blooded animals get greater benefit from the food that they eat, or conversely, do not need to eat as often to get their nutrional requirements.  This gives them an evolutionary advantage in terms of what they can eat and the ability to thrive during famine.
1170818
theoretical advantages of cloning are as follows:\n\nimmortality or at least living thousands of years\n\nendangered species whose demise came directly a result of man\n\nhuman parts factories, where faulty human parts be replaced\n\nstem cells\n\nslaves?\n\nnew friends\n\nclone yourself to make a rival\n\nclone yourself young to make youself forever young... \n\ncreating a clone army to fight for you( or your country) or cause....\n\n individual parts youve cloned can become part of each other in a working organism... theoretically if we can have transplants that become a part of our body without rejecting them.... then we can create our own frankensteins... and living creatures... \n\nif someone had a miscarriage, and wanted that baby\n\ncloning certain genetic information from different people, that is biologically superior or more efficient, and putting those together in a single person  to make a  kindof superhuman....\n\ncloning cancerous cells that can be injected into enemys \n\ncsi- cloning the subject from a hair or other human remnant containing dna.... \n\nseeing what organism from the past would look like by recreating them... hopefully there would be a way to overcome faulty the dna these subjects....\n\nunlawful recreations of celebritys to be used for individual purposes....\n\nmass cloning- for things as insects that eat other insects... like a kindof pesticide.... or to counter attack swarms of anything... locusts,etc\n\ncreating a living creature battery... using their energy to run your device.... and merely feeding them to ensure further energy production... \n\ncloning the genetic isolates from people that make them resistant to things such as aids...\n\nanyway... the list could go on forever...
339602
Yeast is a single cell organism that follows the rules:\n\nIt consumes sugars, and expels the waste as alcohol and carbon dioxide.\n\nIt reproduces, parthenogenically.
383694
In mulitcellular organisms, it is more difficult for cells to take in nutrients and excrete waste.  Single celled organisms can easily do this in their environment.  But in multi-celled organisms, cells are found layer upon layer.  They can't easily get nutrients, and any waste that they excreted would just stay there, building up in toxic quantities that would kill the entire organism.  Thus, we have circulation, a network of vessels that reaches out throughout the organism, easily reaching all the cells and allowing them to do their thing.
650281
Under certain conditions, some one-celled organisms produce a protective form called a cyst that enables them to survive harsh environments.
176550
one, they are what is known as unicellular (having 1 cell).
454209
It is the organic processes (in a cell or organism) that are necessary for life.
306272
You've asked a rather broad question.\n\nHere's a good place to start:\n\nhttp://en.wikipedia.org/wiki/Kingdom_%28biology%29\n\nMore specific questions would be easier to answer.
451866
It depends whether you are talking about organisms that are single cells, or cells that exist in eukaryotic tissues.\n\nThe problem with finding the smallest cells is that they will undoubtedly turn out to be the smallest bacteria... these organisms are likely to exist only in places that are very difficult to reach, because extremely small size is in fact an adaptation to a (typically harsh) environment: reduction in size maximises surface area in proportion to volume.  When life gets very tough, having a maximal surface area is important, because in general, important life processes occur through cell walls and surface membranes.\n\nSome hyperthermophilic archaea (archae-bacteria that colonise hot volcanic and deep subterranean environments) are rod-shaped organisms 0.17 microns in diameter (genus Thermofilium), disk-shaped organisms 0.2-0.3 microns in diameter, 0.08-0.1 thick (genera Thermodiscus & Pyrodictium).\n\nCells in the human body are typically 5-20 microns thick.  I think Bacteria_Boy could be right about the nerve cell.\n\nIndividuals of the genus Acetabularia, a protist (single-celled) marine green alga, are composed of clearly differentiated parts (eg: foot, stalk, head), but grow up to about 5 cm in height.  These are the largest single-celled organisms that I know of.
989899
Question 1:\n5 Kingdoms- Monera, Protista, Fungi, Plantae, Animalia\nMonera:  are single-celled organisms with no organelles or cell nucleus. Often have cell wall in addition to cell membrane.  (includes all forms of bacteria)\nProtista: single-celled, have organelles and nucleus.  Include yeast.\nFungi: Multicellular, have organelles and nucleus, some go through photosynthesis and produce their own food, while others don't.  (includes mushrooms, bread mold, moss)\nPlantae:  Multicellular, organelles present, nucleated, undergo photosynthesis/so they have chloroplasts (includes all plants)\nAnimalia: multicellular, organelles, nucleated, cannot produce their own food, do not undergo photosynthesis.(animals)\n\nQuestion 2.  SOme say there are 6 kingdoms because Kingdom Monera is divided into Eubacteria and Archaebacteria.  Archaebacteria were the first organisms on the planet, and live under harsh conditions (volcanic hot spots underwater, etc).  Eubacteria are different in structure and are present in friendlier conditions (your bathroom floor, toilet, your intestines, etc)\nScientists do this to separate the two different types of bacteria...although most modern books have them all under Monerans
492085
Even single celled organisms engage in an exchange of genetic material, aka s e x.  One organism extends a pili and genetic material is exchanged between it and another microbe that lacks a pili.
451783
2 is always better than 1.  The higher number of sets an organism has, the higher up on the food chain they would be.  An organism with 2 sets of cells would probably eat a 1 cell organism.
508160
Well, it's actually a lot more "great's" than that.  The first single-celled organism has had a *lot* of time to evolve into us.  And that doesn't rule out the existence of God any more than gravity does.\n\nHere's my counter-question:  what sort of evidence would you accept as proof that we evolved from a single-celled organism?\n\nThere's a lot of evidence -- but what would it take to convince you?
692701
The six characteristics of living things, and an explanation of each one. \nTheme #1 - Cells \n\nAll living things are composed of one or more cells. Different types of cells have different "jobs" within the organism. Each life form begins from one cell, which then will split. These cells split, and so on. After this has happened several times, differentiation is undergone, when the cells change so that they are not the same thing anymore. Then they are used to begin to put together the final organism, some cells, for example, as the eyes, some as the heart, etc. The only arguable exception to this is viruses. They are not composed of cells, but are said to be "living." \nTheme#2 - Organization \n\n \nComplex organization patterns are found in all living organisms. They arrange themselves on very small levels, grouping like things together. On larger levels, they become visible. This also has to do with differentiation, as the cells are organized in a manner that makes sense for the organism after they change to what they’ll be in the final organism. \n\nTheme#3 - Energy Use \n\nAll organisms use energy. The sum of the chemical energy they use is called metabolism. This energy is used to carry out everything they do. Autotrophs (plants) use energy from the sun for photosynthesis, to make their own ‘food’ (glucose). Heterotrophs (animals and humans) must ingest food for this purpose. \n\n\nTheme#4 - Homeostasis \n\nAll organisms have stable internal conditions which must be maintained in order to remain alive. These include temperature, water content, heartbeat, and other such things. In a way, this has to do with energy use, because a certain level of energy must be kept within the body at all times. For this, obviously, humans must then ingest food on a regular basis. Not all conditions are for the body to maintain itself; though most are. \n\n\nTheme#5 - Growth \n\nAll organisms grow and change. Cells divide to form new, identical cells. Differentiation happens, as well, when cells mutate into other types of cells, making a more complex organism. Organisms growing, changing, and becoming more complex is called development. Single-celled organisms do grow as well, but they will only become slightly larger – this is nearly unmeasurable. \n\n\nTheme#6 - Reproduction \n\nAll organisms reproduce in order to continue the species' life. This is combining genetic information (in sexual reproduction) or splitting into two organisms (in asexual reproduction) in order to create another of the same species. In sexual reproduction, the new organism will have some characteristics from the mother, and some from father. It may look like either of them, or it may not. In asexual reproduction, the new organism is an exact copy of the first. Sometimes, not every member of a species is able to reproduce. As long as others are (which we know they can, if they still exist today) then it does not threaten the species. (Except for mules, but don't worry about them, they are a bizarre anomoly.)
293000
Hard question to answer.  i seem to remember a professor talking on this very subject so i will try and do him justice.\n\n1) surface tension of the phosopholipid bilayer cannot remain bound together once a cell reaches a certain size. another factor is genetic. the genome (depending on the cell type) has a pre determined size. once it is reache a phenominon called apoptosis or cellular suicide is activated bringing a wierd meaning to the welfare of the many outways the welfare of the one. anther aspect is environment.  depending on the cell and the environment it finds itself in, it must compete for for food.  larger cells need more food.  If the food source of the environment is scarce then it wil die as a result of starvation.  in biologic systems immune resppnse may play a significant factor in making the environment too hostile for life.  However lare single cell organisms do exsist.  I will not hand you the answer but I will give you a hint.  Look to Marine life..  good question!
732894
I'd have to go with 'C.' Many unicellular organisms can get their ATP through anaerobic pathways like fermentation. Some multicellular organisms, such as humans, can generate ATP anaerobically if we had to - like sports involving short powerful bursts of activity. But eventually we'd need areobic pathways for more ATP.