How many type of animals lives or lived on earth?
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Nobody knows, approximately 2 million species have been identified as currently inhabiting the earth, but extrapolations based on the rate of discovery of species and other factors give figures ranging from 3 million to 80 million species.
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the 7 living classes of vertebrate are distuingished mostly on the basis of their skeletal system\n\na) agnatha - consist of jawless fish that don't have scales ex. lampreys and hagfish\nb) chondrichthyes - consisting of hard rubber like cartilages ex. sharks and rays\nc) osteichthyes - bony fish ex. tuna, bass, salmon\nd) amphibia - lives under water and part land ex. frogs, toads, salamander\ne) reptilia - have lungs to breathe on land and skin does not need to be wet ex. turtles, lizards, alligators\nf) aves - include all birds\ng) mammalia - large animals ex. dogs, cats, humans
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.World population\n\nMap of countries by population —showing the population of the People's Republic of China and India, the only two countries to have a population greater than a billion. (See List of countries by population.)\nThe world population is the total number of humans alive on the planet Earth at a given time. As of late 2006, the world population reached 6.5 billion.[1] In line with population projections, this figure continues to grow at rates that were unprecedented prior to the 20th century.
42138
If you are referring to mammals, the blue whale is the largest mammal.  The Blue Whale, Balaenoptera musculus, is also the largest mammal to have ever lived. In fact the Blue whale is the largest animal ever to have lived on the planet as far as we know; bigger by far than ever the largest Dinosaur. The longest Blue Whale ever measured was a female, 33.58 m or 110ft long. The heaviest weighed over 190 tonnes.\n\nThe largest animal on land at the moment on this planet is a mammal; the bull African Elephant. The largest specimen recorded stood around 3.96 m or 13ft at the shoulder and weighed over 12 tonnes.\n\nThe whale shark is a the biggest shark and the biggest fish. It is NOT a whale. It has a huge mouth which can be up to 4 feet (1.4 m) wide.
115702
What species the questioner be about?
696329
Insects are defined as the entirety of class Insecta, and there are about 925,000 different species--more than half of all animal species.  Flies are defined as members of order Diptera, which number about 200,000, and they are a subset of insects.  Mosquitoes are members of the family Culicidae, and are also Dipterans, so they are themselves flies.  There are about 3500 species of mosquito.
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Animals live everywhere on Earth. Some places on Earth are very hot and some are very cold. Some places on Earth have a lot of water and plants, and other places have very little water and few plants. Antarctica is covered with snow and ice and has no plants. It is very cold there, too. Guess what? Animals even live in Antarctica!\n\nAnimals can live in many different places in the world because they have special adaptations to the area they live in. An adaptation is a way an animal's body helps it survive, or live, in its environment. Camels have learned to adapt (or change) so that they can survive.\n\nAnimals depend on their physical features to help them obtain food, keep safe, build homes, withstand weather, and attract mates. These physical features are called called physical adaptations. They makes it possible for the animal to live in a particular place and in a particular way. Each adaptation has been produced by evolution. This means that the adaptations have developed over many generations. The shape of a bird's beak, the number of fingers, colour of the fur, the thickness or thinness of the fur, the shape of the nose or ears are all examples of physical adaptations which help different animals to survive.
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dog, fish, cat, camel, worm
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Each of these common names refers to more than one species (sometimes several) and the extant or available data for each one may differ, therefore I suggest you look at this site: \nhttp://www.demogr.mpg.de/cgi-bin/longevityrecords/entry.plx\n\nwhere you can find well-recorded lifespan data for many species.  \nGood luck :-)
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There are approximately 1.6 to 1.7 million described species on Earth. Estimates exceed 100 million species, but the difficulty lies in our ability to search for and describe them all (some even estimate there are over 100 million bacteria species alone and that our techniques, and interest, to find them limits such numbers).
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The entire world plus animals\n6.5 billion people. Noobs are so high maintanence
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Yes, a fish is classed as an animal. They are vertebrates, there are more than 30,000 different species of fish.
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On Earth, since at the moment at least (and for the forseeable future) Earth is the only place for creatures.\n\nI'd vote for a virus as being the smallest, some are just shells with DNA around them. The smallest viruses are about 20 nanometers across, and the very smallest one known has only 4 genes. I believe this type of virus is so small that its host - the thing it attacks - is a microbe.\n\n\nA lot of depends on how you define a 'creature.' Just recently the worlds smallest fish was found near Sumatra, one that also claimed the smallest creature with backbone award.
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There Are 23 whale species;\n\nSperm Whale \nBlue Whale \nFin Whale \nBryde's Whale \nHumpback Whale \nRight Whale \nMinke Whale \nPygmy Right Whale \nBowhead Whale \nGray Whale \nSei Whale \nNarwhal \nBeluga \nDwarf Sperm Whale \nPygmy Sperm Whale \nCuvier's Beaked Whale \nGiant beaked whale \nShepherd's Beaked Whale \nLongman's Beaked Whale \nBottlenose whale \nMesoplodont whale \nRight whale dolphin \nPilot Whales
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There are about 56 species, so which one do you want?\nI'll say "Rattus adustus," and let you look at the source below for the other 55.
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Plants are a major group of living things including familiar organisms such as trees, flowers, herbs, and ferns. About 350,000 species of plants have been estimated to exist. As of 2004, some 287,655 species had been identified, of which 258,650 are flowering.
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It all depends on humankind. \n\nFirst, about cats and dogs: The best bet would be that cats and dogs will exist as long as humanity lives, maybe a few tens of millions of years longer.\n\nSecond, what will happen next? New clases of animals appear and spread when there is a new type of habitat for them. Either because it is unoccupied (it happened with coming from ocean to land), or because old occupants are dead or less adapted to cope with changed conditions on Earth (that happened with dinosaurs and mammals that took over from them).\n\nRight now, life is more or less everywhere on Earth. So new animals - whatever they will be - will take over from existing mammals and birds only if humankind changes Earth enough, or destroys their competitors.\nChances are that animals able to survive humans (rodents, for example) will be the ancestors of the new classes of animals. \nHowever, if humankind stays on track, WE will create new animals, and choose how they will look like. Alternatively, if humans take animals to other planets where they can survive, there is a chance for new kinds of animals evolving there.