Lab report
The evolution on whales is that the whale is normal and over the time then the whale gets legs or it can devolve other aspects because they might have had different thing going on with other things that are like it because they have cells and they also have same parts but after time they grow other things and so after time they can grow more thing or they can also get rid of things because there body can be strong enough to grow it or weak so they can not make it and sometimes they can make it and they are just not able to make them work. They are like frogs they are tadpoles and they they slowly grow legs and some of the frogs grow 3 legs and that makes it to were they are able to have one but they might not be able to make
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It lived about 48.5 million years ago. Based on the land mammal-like features of the skull, Gingerich hypothesized that this whale probably went into the water tofeed but came out on land to rest and to give birth. After the unexpected discovery of Pakicetus, Gingerich began to hunt for whales in earnest. Whale fossils are large, and they are relatively easy to find in the desert. Sometimes the wind lends a hand by scouring away the sands and shales, leaving entire skeletons exposed. One valley in Egypt was especially rich in whales. On a series of visits starting in 1983, Gingerich and his team found virtually a whale a day. e final tally came to 379 whales. He found some with hipbones, but Gingerich also hoped to find legs and …show more content…
e whole team went to work brushing sand away from this part of all the Basilosaurus that had been mapped so far. Soon they found, astonishingly, not only more hips and upper legs, but also lower leg bones, anklebones, and finally, one by one, the bones of three tiny toes. ese were the first hind limbs and feet ever found with a fossil whale skeleton.
Basilosaurus was a huge ocean-going whale, with retracted nostrils forming a blowhole halfway up its four-foot-long skull. Its body was equipped with legs, but they were too small to support the animal’s weight on land.
Gingerich predicted that scientists would unearth many more missing links be- tween land and sea whales. He wasn’t disappointed. Some of the most important finds were yet to come. In the 1990s J. G. M. ewissen and Gingerich discovered two whales that were almost as old as Pakicetus. Both had legs larger than Basilosaurus, even though the skeletons were only 10 to 12 feet long. One was named Ambulocetus natans and the other Rodhocetus kasranii . Like Pakicetus, both of these whales found their food in water and were good swimmers, but both still hitched their way ashore to rest and to give birth.
Some crucial parts of the Rodhocetus skeleton were still missing. e hands, feet, and tail were poorly known. But Gingerich persevered, and eventually his team
“Whales provide us with the food for our bodies, bones for our tools and implements and spirits for our souls.” “We haven’t hunted the whale for 70 years but have hunted them in our hearts and in our minds.” “Whales are a central focus of our culture today as they have been from the beginning of time.”
“… building a tank the size of Rhode Island wouldn’t be large enough for a six-ton male killer whale such as Tilikum, an animal capable of swimming 100 miles a day,” states an anonymous whale expert. Whales have been in captivity since 1861 when P.T. Barnum displayed the first live whale that was captured in Canada. However, Barnum had no idea how to care for the mammal and it died after only a week in captivity. (Animal Legal and Historical Center, 2014) Being up close with killer whales could give us some clues about how they interact with each other, including physical behavior, their dialect, and how their pods work together as a family unit. However, what we are finding is that whales who belong in the wild are suffering in captivity. Killer whales have no record of ever harming a human being in the wild. In captivity, there have been many incidents of killer whales harming or even killing their trainers. What would cause them to do this in captivity, but not in the wild? They have been known to resort to aggression toward themselves and each other, in what scientist believe to be a stress induced behavior. (Animal Legal and Historical Center, 2014) Evidence against having these wild animals in captivity is increasing and we need reevaluate the value of capturing and holding killer whales for our educational purposes, enjoyment, and profit.
2. Fossils of its pelvis, legs, and feet indicate that it was bipedal, like humans.
Their dorsal fin is extremely long, tampered and pointed in a triangular shape or rounded and curved towards the end. The skull is oval shaped and the beak is extremely short and rounded at the end. The killer whale’s jaw is powerful with teeth that are able to tear apart flesh of their prey. They can withstand the jolting, wiggling and hurtling movements of prey that are trying to escape. The killer whale is born with a single blow hole instead of two. Their flippers are paddle shaped with rounded ends and flukes are tapered back and pointed at the end resembling to a triangle/pyramid
Shirihai, H. and B. Jarrett (2006). Whales, Dolphins and Other Marine Mammals of the World. Princeton, Princeton University Press. p.185-188.
whales, the toothed whales. Two sides of the argument were strongly represented in this article, along with the common practices of dismissing the opposite opinion. Instead of building off each others opinion and research, scientists are quick to dismiss the opposing opinion as false or incredible. Without an understanding of the other conclusions, working together and analyzing each other's evidence along with yours, minor set backs are relied on to keep us moving forward.
Tetrapods are creatures with four limbs, hips, shoulders, fingers, and toes, which developed sometime after lobe-finned fish, and before the first fully terrestrial vertebrates. The earliest tetrapod known is Acanthostega. It is also considered the most primitive tetrapod. It is very close to its fish ancestry, but still anatomically far from its terrestrial relatives. These creatures still lived in water, but they had a lot of the terrestrial tetrapod anatomical characteristics.
In the scientific article “A giant sauropod dinosaur from an upper Cretaceous mangrove deposit in Egypt,” by Joshua Smith, Matthew Lamanna, Kenneth Lacovara, and Peter Dodson it is indicated that a giant sauropod named Paralititan Stomeri was discovered in a desert area in western Egypt in 2001. The skeleton was dated back to ninety to one hundred million years ago, which is the late Cretaceous period. Paralititan is a sauropod, which is thought to be the second largest that has ever lived. A partial skeleton of this enormous sauropod was found. What was found is seen when the authors write, “The specimen consists largely of vertebrae, pectoral girdle, and forelimb elements” (Dodson, Lacovara, Lamanna, and Smith). The largest bone found was a 1.69 meter long humerus, which is an upper arm bone. This was the first find in the area since 1935.
Mojetta and Discovery Channel had a lot of strong data on prehistoric sharks. The information that was presented in their text gives people knowledge of prehistoric sharks characteristics, time frame they lived in and the remains of these creatures. These bits of information might raise more questions for people about evolution. There have been many different species of prehistoric sharks discovered throughout the years.
After searching she returned with four tons of rock and spent four years searching through them. When she was done, she had the most complete early tetrapod skeleton ever found. She soon discovered that the complete tetrapod was of Acanthostega, the first, earliest tetrapod that was found to have fingers.
Sea Shepherd Conservation Society "The Makah Whale Hunt" 02 Online. Internet 3 Febuary 2003. Available www:seashepherd.org/media_info/asp.
When these alterations are helpful, they grow to be fixed in a population and can result in the evolution of new phyla. Evo-devo seeks to figure out how new groups happen by understanding how the method of development has evolved in different lineages. In other word, evo-devo explains the interaction between phenotype and genotype (Hall, 2007). Explanation of morphological novelty of evolutionary origins is one of the middle challenges in current evolutionary biology, and is intertwined with energetic discussion regarding how to connect developmental biology to standard perspectives from the theory of evolution (Laubichler, 2010). A large amount of theoretical and experiential effort is being devoted to novelties that have challenged biologists for more than one hundred years, for instance, the basis of fins in fish, the fin-to-limb change and the evolution of feathers.
The Humpback Whale, Megaptera novaeangliae, is part of the marine mammals group. They are found in oceans all over the world, they live in open waters. Even though they are mammals, they do not live on land (Monterey Bay Aquarium). Humpback whales are known for their magical song that can travel great distances. These gentle giants are omnivores, their main diet is krill. They are mostly found near coastlines feeding on tiny shrimp-like krill, plankton and small fish. Humpbacks migrate annually from summer feeding grounds near the poles to warmer winter breeding water closer to the Equator. Humpback whales are powerful swimmers, and they use their massive tail fin, called a fluke to propel themselves through or even out of the water! Mothers and their young swim close together, often touching one another with their flippers with what appears to be gestures of affection. Even though it takes more than one year for a humpback whale to grow fully, mother whales leave them after one year (National Geographic).
Did you know in the world there are more than 90 species of whales, dolphins, and porpoises? (WDC) The dolphin is a very important animal to the ocean and there are many different types to discover. In order to learn about dolphins, it is important to discuss where they live, their appearance, and what they eat. Some helpful words to understand are “dorsal fin”, a dorsal fin is the top pointed fin on the dolphins back, “flippers”, a flipper is a flat fin that dolphins use to swim, and “echolocation” is a tool dolphins use to find food by sounds bouncing off of objects (dictionary.com).