Why most of the creatures in the world have four legs, like human &#92; lion &#92; even birds?
917889
Actually, the statement is not true. Most creatures in the world don't have four legs. Insects, with 6 legs, are far more abundant than all four legged creatures. \n\nHowever, the main groups of vertebrates - amphibians, reptiles, mammals and birds all evolved from a common tetrapod (meaning four-legged) ancestor. This is the reason they all have four legs, even if they have subsequently lost them (such as snakes, whales, etc). \n\nFish are also vertebrates. However, they are an evolutionarily older group, and the tetrapod ancestor of the other vertebrates is believed to have evolved from sarcopterygii, which evolved from lobe finned fishes.
479072
Those animals have adapted so that they stick out, with vibrant colors that lead the predators away from the females and offspring.\n\nMale humans are supposed to be just bigger, stronger and more capable of protection and hunting, and humans when they were in the wild had no use for an adaptation in appereance.
809550
A centipede has a pair of legs for every segment of its body.\nThis makes it differ from millipede which has at least two pairs of legs for every segment
982526
That depends upon the body.  Not everyone weighs the same.  Skeletons also vary.  Then there is the question, "Were you referring to human bodies"?  Different animals have differing bone structures.  Most birds have very light skeletons by comparison to other animals.
301829
Humans evolved from animals and most of them haven't really come very far.  The rest of us must do what we can to make the world a better place despite their presence.
947772
These birds do not all have the same foot posture.  For example ostrich feet sit flat on the ground for walking while songbirds toes are designed to be able to curl and grip branches when they perch.  Birds like eagles have raptorial feet with long talons for capturing prey.  \nHope this helps
680182
It's not saying that there are only insects with four legs.\n\nIt's saying- in verse 21- that there are some insects you can eat- those with four feet which are used to jump to the Earth with \n\nthen in verse 22: for example, the locust, the bald locust, the beetle, the grasshoper, etc.\n\nSometimes it helps to read other versions other than King James Version (which can be harder to read)\n\nFrom the New international version:\n\nThere are, however, some winged creatures that walk on all fours that you may eat: those that have jointed legs for hopping on the ground. 22 Of these you may eat any kind of locust, katydid, cricket or grasshopper. 23 But all other winged creatures that have four legs you are to detest.\n\n\n\nverse 23: but any other insects (other than those listed above) you shall not eat.
807367
While humans are animals there are few things that make us different from the other animals.  Much in the same way cats are different than dogs.\n\nPhysical (not all of these are unique to humans but the combination of all them is)  \nBrain size: brains take up a larger mass relative to size \nour thumbs\nwalk upright on two feet \nno fur (yes we have a little but not much)\nchildhood is much longer\n\nHumans are able to use abstract thoughts more proficiently than our animal cousins (math, art, language)\nWe can refine tools.  Other animals use tools, (chimps elephants) but they don't refine them.\nHumans can pass on information over many generations\n\nThis is not exclusive list, but I believe I have hit some of the most important points
860345
No, they aren't.\n\nHumans have a stronger preference for one hand over the other than other animals. That is thought to be due to language being localized on one side of the brain, so motor control gets unevenly dominant (your right side of the brain controls your left hand). Animals don't have the languge skills, and tend to use both paws about equally.
1144351
Animals use four legs for their motion. Man, learning to balance on two legs, uses two legs for their motion. Boats move with the aid of two or more oars. \n\nIn all these the common thing is a pushing force is applied in a direction opposite to the direction of motion. \n\nWhen wheels are invented, wheels are being used for motion. We can imagine a wheel as having infinite number of legs. Thus using wheels speed is increased. The motion becomes continuous and not in jerks.\n\nCompared to a mountain a stone is nothing. Similarly compared to wheel leg is nothing.\n\nBirds use two wings to push the air in a direction such that it is lifted as well as pushed forward; in short for flying. \n\n The propeller in plane uses the principle of wheel for pushing air; infinite numbers of wings are used instead of two wings.  Thus a continuous push of air is obtained instead of intermittent push like birds do push.\n\nIf we construct a plane which uses the motion of two wings for its flying, it is equivalent to have a car which uses four legs instead of  four  wheels.
884047
You know, most of the world's animal species do not have common names.  Only those that average folks are fairly well aquainted with end up with common names.  Most vertebrates have common names, but most invertebrates don't, except those that are popular with many people, like butterflies.
1173981
Er...more that just mammals have dual lungs buddy.  \n\nIn fact, any creature that has lungs (amphibians/turtles, reptiles/birds, and mammals) have a set of two lungs.  The listed classes of animals all have bilateral symmetry, meaning they have two identical sides.  Hence, they have two lungs!
689293
actually, insects have 6 legs, arachnids (spiders) have 8.\n\n6 legs is actually a very efficient and simple mode of moving.  When an insect walks the front and rear legs on one side along with the middle leg on the other move in lock step while the other 3 form a stable platform for the insect.
530920
we have four limbs, being two hands and two legs. That's just how we evolved.
1147104
because humans are animals\n\n...not plants
206614
some animals were them on the outsied insects and lobsters.\ninvertabreas dont have a spine and some dont have any bones!
405857
Apes and humans.  As opposed to feathered bipeds, birds.