What is the major difference between a shark skeleton and an adult human skeleton?
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Sharks don't have skeletons made of bones, they have cartilage instead.
1083953
The skeleton has two main parts: the axial skeleton and the appendicular skeleton. The axial skeleton consists of the skull, the spine, the ribs and the sternum (breastbone) and includes 80 bones. The appendicular skeleton, consisting of 126 bones,  includes two limb girdles (the shoulders and pelvis) and their attached limb bones.  \n\nBTW -why not learn to use google like everyone else!
520975
That's an interesting question!\nThe short answer would be "Different evolutionary paths", which is true. But those paths imply adaptive and functional differences. \nThe teeth of sharks are not too different from those of other tetrapods. Aside from birds, most tetrapods have many generations of teeth (this is called polyphyodonty), and those teeth are usually not strongly attached to the jaws. They`re more or less easily lost and replaced during normal activities. So, why don't we mammals have such a useful feature? \nThe loss of all those teeth replacements was a tradeoff for our acquisition of better tooth occlusion. Occlusion is the way the surfaces of the upper and lower teeth contact each other, and in mammals, our chewing teeth (molars and premolars) have complex occlusal surfaces, which allow for slicing food (shearing like scissors), crushing food (cusps and basins that act like a mortar and pestle), and other ways of basically, disintegrating food items. \nThe thing is, the precise interlocking of cusps and vales is not easy to achieve (as anybody with occlusion problems has probably heard from the dentist). So the hypothesis is that the evolutionary path of mammals "focused" on one generation of perfectly occluding teeth. Thus, molars erupt late in life, grow slowly, and are not replaced. And the other teeth (incisors, canines and premolars) have a first, "milk" teeth generation that allows the young mammal to feed while its skull is expanding. Then, by the time its growth has slowed down, the definitive teeth erupt and take their places (they would not fit in the small jaws).\nThe teeth of man, as those of all primates, are brachydont. This means that they don't keep growing once they've erupted completely. However, the enamel that forms the outer cover of the teeth is the hardest substance in our bodies, and is able to endure the wear from our food. However, many other mammals that eat more abrasive foods (plants, and especially grasses) have permanently growing teeth (hypsodonty). This is, in a way, the equivalent of having multiple generations of teeth; their teeth keep growing throughout part of their lives (as in the case of horses) or all of their lives (like many rodents and ruminants). But we cannot "recover" the capacity for multiple teeth generations that we "gave up" evolutionarily when we became mammals.
1033236
bones break down with age and poor nutrition - similalry they show development changes with age and good nutriton\n\nmales and females differ slightly in pelvis and skull and in lnegths and thinckness of bones as do different races etc
417108
safety in numbers, being omnivorous we need several types of teeth for different foods. Also like sharks, we are apt to lose teeth, unfortunately unlike shark we cant grow them back. so separate teeth  mean that each one has a potential for not falling out
855593
I would look here for your answer and/or a link that could get you your answer http://en.wikipedia.org/wiki/Vertebrate\n\nGood Luck!!!
86309
The infant skeleton has the following bones in addition to those of an adult:\n\n   1. sacral vertebrae (4 or 5), which fuse in adults to form the sacrum\n   2. coccygeal vertebrae (3 to 5), which fuse in adults to form the coccyx\n   3. ilium, ischium and pubis, which fuse in adults to form the pelvic girdle\n\nAs you can see, the increased number of bones is just because as infants mature, some bones fuse into eachother to become one bone.
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Most sharks are ovoviviporous with the eggs being fertilized by a male but developing internally. There would be numerous eggs all in a clump, whereas a single ostrich egg would be larger than one individual shark egg, not a clump of sharks eggs.
102110
A typical adult human skeleton consists of the following 206 bones.\nIn the skull (22):\n\nCranial bones: \n1. frontal bone \n2. parietal bone (2) \n3. temporal bone (2) \n4. occipital bone \nsphenoid bone \nethmoid bone \nFacial bones: \n5. zygomatic bone (2) \n6. superior and inferior maxilla \n9. nasal bone (2) \n7. mandible \npalatine bone (2) \nlacrimal bone (2) \nvomer bone \ninferior nasal conchae (2) \nIn the middle ears (6):\n\nmalleus (2) \nincus (2) \nstapes (2) \nIn the throat (1):\n\nhyoid bone \nIn the shoulder girdle (4):\n\n25. clavicle or collarbone (2) \n29. scapula or shoulder blade (2) \nIn the thorax (25):\n\n10. sternum \n28. ribs (2 x 12) \nIn the vertebral column (24):\n\n8. cervical vertebrae (7) incl. atlas & axis \n14. lumbar vertebrae (5) \nthoracic vertebrae (12) \nIn the arms (6):\n\n11. humerus (2) \n26. condyles of humerus \n12. ulna (2) \n13. radius (2) \n27. head of radius \nIn the hands (54):\n\nWrist (carpal) bones: \nscaphoid bone (2) \nlunate bone (2) \ntriquetrum bone (2) \npisiform bone (2) \nTrapezium (bone) (2) \ntrapezoid bone (2) \ncapitate bone (2) \nhamate bone (2) \nPalm or metacarpal bones: \nmetacarpal bones (5 × 2) \nFinger bones or phalanges: \nproximal phalanges (5 × 2) \nintermediate phalanges (4 × 2) \ndistal phalanges (5 × 2) \nIn the pelvis (4):\n\n15. ossa coxa (hip bones or innominate bones) (2) \n16. sacrum \ncoccyx \nIn the legs (8):\n\n17. femur (2) \n22. greater trochanter of femur \n23. condyles of femur \n19. patella (2) \n20. tibia (2) \n21. fibula (2) \nIn the feet (52):\n\nAnkle (tarsal) bones: \ncalcaneus (heel bone) (2) \ntalus (2) \nnavicular bone (2) \nmedial cuneiform bone (2) \nintermediate cuneiform bone (2) \nlateral cuneiform bone (2) \ncuboidal bone (2) \nInstep bones: \nmetatarsal bone (5 × 2) \nToe bones: \nproximal phalanges (5 × 2) \nintermediate phalanges (4 × 2) \ndistal phalanges (5 × 2) \nThe infant skeleton has the following bones in addition to those above:\n\nsacral vertebrae (4 or 5), which fuse in adults to form the sacrum \ncoccygeal vertebrae (3 to 5), which fuse in adults to form the coccyx \nilium, ischium and pubis, which fuse in adults to form the pelvic girdle
6640
The first three are mammals. The shark is a fish. To know whether "fishlike" sea denizens are fish or not, the rule is: if the tail is vertical and moves from left to right (like the shark) then it's a fish; if the tail is horizontal and moves up and down to propel the animal, it's a mammal (like the whale).
332211
Here's an answer that wasn't copied and pasted from somewhere on the net...\n\nLong bones, which are the bones of your arms and legs, can be broken into two regions. The "knobs" located at both ends of the bone are called the epiphyses. The long, narrow portion of the bone is called the diaphysis. Located at each end of the bone between the epiphysis and diaphysis is a region called the epiphyseal plate.\n\nThe epiphyseal plate is more commonly referred to as the "growth plate". In a growing human, the epiphyseal plate contains many chondrocytes. The chondrocytes produce chondrin, which is the material that composes cartlidge. This new cartilidge lengthens the bone. Osteoblasts then convert this newly formed cartlidge into bone.\n\nIn adult humans who have finished growing, the epiphyseal plate has been completely replaced by solid bone. A quick x-ray can therefore determine whether an adult human has finished growing by the presence or absence of the epiphyseal plate.\n\nChondrocytes are also located in other parts of the body where cartlidge is present, like the nose, ears, larynx, trachea, and skeletal joints.
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I do now they replace their teeth every 6-8 weeks allowing the front row to drop out and a new row to come up behind. They typically have 2-4 rows of teeth showing at any one time. This means that the shark goes through thousands of teeth and hundreds of rows in a lifetime.\n\nThey must shed atleast 50,000 teeth then...if you're counting. Its one reason why prehistoric shark teeth are the most commonly found fossils.
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a mammal’s inner support frame, called a skeleton, is composed of two parts, the axial (including the skull, vertebral column, thoracic basket, and pelvic girdle), and the appendicular (consisting of the bones of the limbs, or appendages). \n\nThe Skeletal System serves many important functions; it provides the shape and form for our bodies in addition to supporting, protecting, allowing bodily movement, producing blood for the body, and storing minerals.\n\nFunctions\n\nIts 206 bones form a rigid framework to which the softer tissues and organs of the body are attached. \n\nVital organs are protected by the skeletal system. The brain is protected by the surrounding skull as the heart and lungs are encased by the sternum and rib cage.\n\nBodily movement is carried out by the interaction of the muscular and skeletal systems. For this reason, they are often grouped together as the musculo-skeletal system. Muscles are connected to bones by tendons. Bones are connected to each other by ligaments. Where bones meet one another is typically called a joint. Muscles which cause movement of a joint are connected to two different bones and contract to pull them together. An example would be the contraction of the biceps and a relaxation of the triceps. This produces a bend at the elbow. The contraction of the triceps and relaxation of the biceps produces the effect of straightening the arm.\n\nBlood cells are produced by the marrow located in some bones. An average of 2.6 million red blood cells are produced each second by the bone marrow to replace those worn out and destroyed by the liver. \n\nBones serve as a storage area for minerals such as calcium and phosphorus. When an excess is present in the blood, buildup will occur within the bones. When the supply of these minerals within the blood is low, it will be withdrawn from the bones to replenish the supply. \n\nDivisions of the Skeleton\n\nThe human skeleton is divided into two distinct parts:\n\nThe axial skeleton consists of bones that form the axis of the body and support and protect the organs of the head, neck, and trunk.\n\nThe Skull \nThe Sternum\nThe Ribs\nThe Vertebral Column \n\nThe appendicular skeleton is composed of bones that anchor the appendages to the axial skeleton.\n\nThe Upper Extremities\nThe Lower Extremities\nThe Shoulder Girdle\nThe Pelvic Girdle--(the sacrum and coccyx are considered part of the vertebral column)
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They aren't "preserved" except in form. They are replaced by minerals, the major exception being calcium carbonate shells of things like oysters and clams (Mollusks), but those are shells and might not be considered "body parts" as they are not the soft tissue. Most fossil bones are replaced with a mineral. Most fossil wood is replaced with minerals, but some actual parts of the wood sometimes remain. Fossil insects imbedded in amber are the real original bug, but probably aren't really a fossil.
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By just looking at the pelvic bone you might be able to tell if the skeleton is from a man or a woman. Women have "child-bearing" hips, which means they are wider set so a baby can pass through. Men have pelvic bones that are more narrow (because nothing has to pass through!)
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The answer is a combination of several factors.\n\nThe skin is designed so as to limit "wrinkling" while swimming. (hydrodynamics) If u look at the skin closely, they consist of placoid scales which r smooth in one direction (swimming direction), and rough in the other direction.\n\nSharks r seriously buffed up, which aids in generating work.\n\nFins stabilise the body to prevent it from swimming upside down or in a circle\n\nThey belong to the chondrichthyes... cartilaginous fishes. This skeletal system is lighter than boney frames and allows for greater flexibility. Both characteristics COULD help in swimming. (There r, however, many fast marine animals with boney frames such as the dolphin or swordfish).\n\nThe tail is the main propulsion force. Which works in coordination with it's respiratory and circulatory system. As water passes over the gills, the lamellae r oxygenated, and at the same time release waste products (co2). So, if the shark swims slowly, the respiration rate decreases... and if he doesn't swim at all, he suffocates. I guess sharks swim fast because they have to. Haha. I hope that's helpful.
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On average, an adult human has 206 bones (according to Gray's Anatomy, but the number can vary slightly from individual to individual), but a baby is born with approximately 270. The difference comes from a number of small bones that fuse together during growth. They leave pockets of cartilage to allow more growth. The sacrum (the bone at the base of the spine) consists of six bones which are separated at birth but fuse together into a solid structure in later years. Growing is usually completed between ages 12 and 14. This means that the bones have no pockets of cartilage left, so there is no material left to allow more growth.