Although adult crocodiles have no natural predators other than humans, hatchlings have a high mortality rate and are preyed upon by other wildlife including raccoons, birds, and crabs. True. FL It is present in some mammals like rodents, primates (superorder: eurachontoglires) and help in digesting cellulose and other such indigestible . However, as the population changed due . The scales covering the head are very thin, relative to those of the rest of the body, and those along the sides of the jaws have pronounced sensory pits in them. The teeth of the upper and lower jaws intermesh perfectly when the jaws are closed, giving yet another means of holding firmly whatever they grasp. The observation of vestigial structures in living organisms was first described by Aristotle, in his fourth century BC book, History of Animals (Aristotle, c. 350 BC). The stomach will frequently have stones in it; this is a feature that researchers feel helps the crocodile to digest its food. Male crocodiles are larger than females and can reach about 20 feet in length but rarely exceed 14 feet in the wild. Like many nocturnal animals, crocodiles have eyes with vertical, slit-shaped pupils; these narrow in bright light and widen in darkness, thus controlling the amount of light that enters. This book is a word-for-word transcript of the famous court test of the Tennessee Anti-Evolution Act, at Dayton, July 10 to 21, 1925, including speeches and arguments of attorneys, testimony of noted scientists . They use their teeth to catch and eat prey. In contrast, two strong people equipped with an assortment of levers are required to force open the mouth of a 1 m long crocodilian against the action of the muscles holding it shut. American Crocodile Letter c in the picture indicates the undeveloped hind legs of a baleen whale. (PDF, 1.9 MB), The Nest Environment of the American Crocodile In some cases the structure becomes detrimental to the organism. Evidence-of-Evolution-Answer-Key (1) - Studylib They developed their most powerful evolutionary characteristics millions of years ago. Chapter 5 Bio EOC Review Flashcards | Quizlet Evolution sometimes develops new traits in the creature. This "minimum exposure" posture has been important to crocodilians throughout their evolution. Alligators and crocodiles are closely related to an ancient fossil dating back 210 million years. Relate the differences you see in form to the . Skins from them can be used to make clothes, bags, shoes, wallets, ornaments, and other items. The reptile class is one of the largest classes of vertebrates. Crocodiles can have almost 60 mouths at a time, compared to only 5 mouths for us! Human Vestiges. Crocodiles have cold skin, just as dinosaurs used to be (or at least they used to be). This process is vestigial in humans because we don't have enough hair or fur to make it worthwhile. American Crocodile: Species Profile - National Park Service vestigial structures in crocodiles Excavations in South Korea yielded footprints from the prehistoric era. In the Gharial, Tomistoma and other narrow-snouted species such as the Australian Freshwater Crocodile, the teeth can be very sharp indeed. On the back wall of the eye, the tapetum lucidum reflects incoming light, thus utilizing the small amount of light available at night to best advantage. The sense of smell is well developed and may even operate in the egg prior to hatching. There is a strong resemblance between fossils and dinosaurs that evolved 80 million years later. > d. Beetles share a common ancestor with moths. The mixing of blood can be advantageous to a diving reptile. Crocodiles, unlike most reptiles, have a cerebral cortex and a four-chambered heart.

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