Evolution of the Earth The planet earth has gone through much abuse and punishment in the past. Formed approximately 4.5 billion years ago‚ the earth has undergone multiple catastrophic asteroids erasing species after species. Due to geologic evidence‚ it is estimated over 90 percent of all life that had ever lived in this planet have been extinct. No more than the past 500 million years alone‚ 50-90 percent of all organisms on earth were wiped out of the geological timeline without any warning
Premium Geologic time scale Earth Geology
birds and their relationship to dinosaurs has raged on. After the 1860s birds have been hypothesized as being closely related to an ample assortment of extant and extinct reptile lineages. These include a diversity of basal archosaurs and archosauromorphs‚ pterosaurs‚ crocodylomorphs (including modern crocodylians and their Mesozoic relatives)‚ and various theropod ornithischian dinosaurs. Phylogenetic systematics is the field in which systematists use clues from the rock record to reconstruct evolutionary
Premium Dinosaur Bird Theropoda
Biodiversity is a necessity to sustain life on Earth‚ each species playing an important role in the various cycles which maintain and sustain life on the planet. Without one species another species who depends on it could go extinct or over-populate without the other to control it‚ causing a domino effect that disrupts the balance of life as a whole and the overall biodiversity of this planet. The Alligator Snapping Turtle is one of those various species which helps to promote life and maintain a
Premium Biodiversity Ecology Natural environment
Chapter 25 Process of fossilization · Moving water can suspend sediment – inorganic particles · Moving water fills into still body of water o Sediment flats to the bottom o Forms a layer o More layers form with different compositions on the bottom of the lake or ocean · Living things in the ocean die and get buried in the sediments in the ocean · A lot of weight and pressure pushing down · The organic material is replaced by rocks – mineralization resulting
Premium Water Ocean Oxygen
Tyrannosaurus rex means "tyrant lizard king" .It is also called T.Rex abbreviation. The first T. rex was first found by Barnum Brown in 1902. The first T. rex was found in Hell Creek‚ Montana‚ USA‚ North America. Tyrannosaurus rex was a meat-eater about 40 feet (12.4 m) long‚ about 15-20 feet (4.6-6 m) tall‚ and about 5-7 tons in weight. T. rex probably had about 200 bones‚ roughly the same as us (no one knows exactly how many it had‚ since no complete T. Rex Skeletons have been found). About a
Premium Dinosaur
Alamosaurus Most people think of dinosaurs as enormous‚ aggressive and extinct reptiles. That is largely true‚ however there are some misconceptions. They came in all sizes and shapes. Dinosaurs were the biggest land animals on this planet‚ but several of dinosaurs were smaller than a donkey or a pig. One of the gigantic dinosaurs that is very interesting to study more about it is called “Alamosaurus.” The meaning of Alamosaurus is "Ojo Alamo lizard." It was named after the Ojo Alamo sandstone formation
Premium Dinosaur
Wales ABSTRACT This thesis began as an investigation into evolution of the platypus family (Ornithorhynchidae‚ Monotremata)‚ now known from both Australia and South America. The thesis broadened its scope with inclusion of non-ornithorhynchid Mesozoic monotremes from Lightning Ridge‚ NSW. This change in direction brought an unexpected result: a fossil mammal from Lightning Ridge investigated for this thesis (presumed to be monotreme: Flannery et al.‚ 1995) appears to be a new and unique type of
Premium Mammal
deserts 2.4 Western and Central Asia 2.5 East Asia 2.6 Indian Subcontinent 2.7 Indochina 2.8 Sunda shelf and the Philippines 2.9 Freshwater 2.10 Marine fauna 3 Reptiles 4 Birds 5 Mammals 6 Human impact 7 See also 8 References Origins of Asian Fauna[edit source | editbeta] The formation of the Asian fauna began in the Mesozoic with the splitting of Laurasian supercontinent. Asia blends elements from the both ancient supercontinents of Laurasia and Gondwana. Gondwanian elements were introduced
Premium Asia South Asia
COMPARATIVE VERTEBRATE ANATOMY -study of the structure(descriptive morphology) and of the functional significance of structure(fumctional morphology) of the vertebrate Ontogenesis- development of the invidual Phylogenesis-ancestral history; is is a study of history and of animals that no longer inhabit the earh and known to us by a fossil record *Craniates- hagfish and vertebrates THE PHYLUM CHORDATA: THE BIG FOUR It is falling into two categories: a. lacks vertebral columns (invertebrates)
Premium Vertebra Nervous system Muscle
actually reptiles‚ this means when they were hatched and born‚ they had no fur. Dinosaurs and lizards are in a way similar but also very different. The main difference between the two is how their legs join to the hips. Lizards have legs in a squatted position‚ with the legs going outwards. However dinosaurs have legs similar to humans where they go straight down! The dinosaurs were first around about 245 million years ago‚ during the Mesozoic Era; which is often called the Age of the Reptiles. This
Premium Dinosaur Theory Plate tectonics