The homologous structure evolved as a result of adaptation to various environments, whereas the analogous structure evolved as a result of different species' adaptation to similar environments. Adults have grayish-green backs and tails and white to yellowish undersides. The hind legs are more powerfully developed than the front pair, and the hind feet have only four toes, which are wholly or partially webbed. DISSERTATIONS Indeed the crocodilian ear is considered the most specialised within the Class Reptilia. This process is vestigial in humans because we don't have enough hair or fur to make it worthwhile. Crocodiles are one of the most iconic and ancient creatures on Earth, having remained relatively unchanged for millions of years. A crocodile species is thought to have walked on two legs thousands of years ago. These are most pronounced along the back, and are responsible for the keeled shape of the back scales. In contrast to the back and belly, the sides of the body have mostly small knobby scales. The bones do not leave the body and seem to only provide minor support to the muscles. Quiz, Wild Words from the Animal Kingdom Vocabulary Quiz, snout differences between crocodiles and alligators. The crocodilian stomach is a bag-like structure, with the inflow and outflow tracts next to each other. Goosebumps: The pilomotor reflex, which raises the hair on your arms or neck when you feel alarmed, is vestigial in humans, but it's pretty useful for porcupines who raise their quills at a sign of dangeror birds, who fluff up when it gets cold. They have long, thick bodies and tails, and their skin is covered in tough scales. 3. Reptiles are a class of ectothermic, tetrapod vertebrates. Activity: Evidence of Evolution Structures - Google Docs The study of fossils as well as work in embryology, biochemistry and comparative anatomy provides evidence for evolution. Saltwater Crocodiles never have osteoderms in the belly scales, and the skin of this species, when tanned, gives a uniformly coloured and smooth textured piece of leather - the skins of this species are the most highly prized of all crocodilians. Alligators are more numerous in Florida than crocodiles, are darker, have a broader snout, and are typically found in freshwater habitats. The stomach will frequently have stones in it; this is a feature that researchers feel helps the crocodile to digest its food. For example, as shown in Figure below, the skin of most reptiles is covered with scales. These structural dissimilarities suggest that bird wings and bat wings were not inherited from a common ancestor . Lindell worked in greyhound racing for 25 years. Vestigial Organs. This is the distance a crocodile can leap and attack its prey. The extent to which bone is deposited in the belly scales varies between species and within the one species from different areas. The second advantage is that they live in areas where the asteroid is more likely to have no impact on them. National Wildlife Federation: The Crocodile's Power Play. Evolution can develop Homologous Structure. ambush predators that swim close to their prey as it drinks from a river The crocodile then uses its powerful tail to move forward, allowing it to bite its prey. Letter c in the picture indicates the undeveloped hind legs of a baleen whale. Hair sometimes accumulates as hairballs within the stomach, and may later be regurgitated. The crocodile has the ability to propel itself through the water with its long, powerful tail by whipping it back and forth. Encyclopdia Britannica, Inc. Did you know some snakes still have tiny feet from 150 million years ago in their past?
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