what is the most cardiovascular organism on the planet?
461482
well the biggest of course. the biggest would have the most vasculature to keep all of its little cells alive. And that marvelous animal would be the blue whale a huge a$$ mammal with a huge a$$ heart and huge a$$ vessels.
1098733
The average human heart beats approximately two billion times in a lifetime.
394778
animal\nplant\nbacteria\nalgae\nmicro-organisms
64374
The above answer is correct, but the cardiovascular system is not just the heart. That's the "cardio", but the "vascular" part is all of the arteries, veins, and capillaries that distribute the blood throughout the body.\nThe respiratory system does indeed oxygenate the blood, but is also responsible for eliminating carbon dioxide from the body as well. As the body uses oxygen for metabolism, it produces carbon dioxide. If this is not eliminated from the body fairly quickly, it builds up, and without going into alot of detail, you die.
502469
Sperm Whale. I don't believe they kill their own kind over oil and religion so I'd say they were more intelligent than a lot of humans :)
243597
An ameba. It is a single cell organism according to science book years ago. But I suspect the earlier answer as a virus is also correct.
301782
depends, bacteria are classified by their ssRNA plants and animals are usually categorized by their morphological characteristics. The more specific you are, the better answers you'll receive.
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!
449248
Every part of your body is important.  Afterall, God created us and He doesn't give us useless body parts.  However, you'll die the fastest when your heart stops so based on that reasoning, I would say that your heart is the most important.
217917
the amoeba i guess, it is unicellular.the largest ones are 1 mm across
165602
You can visit the Encarta Website. Specific\n\nSystemic Circulation:Heart-Body\nhttp://encarta.msn.com/encyclopedia_761566878/Circulatory_System.html\n\nPulmonary Circulation:Body-Heart\nhttp://encarta.msn.com/encyclopedia_761566878_2/Circulatory_System.html
13523
Rabbit.  Also the most digestable.  You didn't say, but fish is considered a meat also.  In that case, scallops and lobster are lower than anything with legs on them.  Bon Appetite.
664236
The blue whale is the largest animal on Earth.  Its heart is the size of a Volkswagen Bug, its tail is as wide as the wingspan of a small aircraft, and some of its blood vessels are so wide that you could swim through them.  \n\nIt is also considered the loudest animal by decibel measure, but since sound travels better than water than through air, perhaps a land animal (i.e. african elephant) deserves the title.
326392
The largest extant organism is the honey mushroom which can spread 2,200 acres (1,665 football fields) underground.  The second largest living organism is General Sherman, a giant sequoia. It's 272ft tall, has a circumference of 109ft at its base, and weighs nearly 1,400lb.
376903
the first answer is definitely "bacteria" and the second has to be "cyanobacteria"
707688
Multicellular organisms
1054557
Biggest Thing "ON" Earth?\n\nSUN...  Yes... It is Sun