There was a minor mass extinction toward the end of the Jurassic period. A stegosaurus had a large, flat, bony, triangular plates along its back . As well as a heavy, spiked tail for protection. A stegosaurus also had a very small head with a tiny brain and toothless beak . Their brain size can be compared to a size of a walnut.
Andrew-sarchs Andrewsarchus (named for paleontologist Roy Chapman Andrews, who led the expedition on which it was found) was a primitive, carnivorous mammal that lived during the early Eocene Epoch, roughly 45 million years ago. This giant creodont was heavily-built and wolf-like. Andrewsarchus may be an ancestor of the whales. Fossils have been found in Mongolia; 4. Cave Lion 5.
Species occur in over 400 in general. There are many more species of plant –eating dinosaurs named than carnivores because carnivores were fewer in number. Where did dinosaurs live? Dinosaurs lived everywhere on earth, including the South Pole, which had no ice then. Do we have any living dinosaurs today, like the coelacanth or Komodo dragon?
are the most diverse group of vertebrates besides perciform fish.and heights of General description Using one of the above definitions, dinosaurs can be generally described as archosaurs with hind limbs held erect beneath the body. This posture is due to the development of a laterally facing recess in the pelvis and a corresponding inwardly facing distinct head on the femur. Paleontologists think that Eoraptor resembles the common ancestor of all dinosaurs; When dinosaurs appeared, they were not the dominant terrestrial animals. The terrestrial habitats were occupied by various types of archosauromorphs and therapsids, like cynodonts and rhynchosaurs. Their main competitors were the pseudosuchia, such as aetosaurs, ornithosuchids and rauisuchians, which were more successful than the dinosaurs.
The name dinosaur translates as 'terrible or wondrous lizards' and they certainly evolved in a huge range of sizes and shapes, from the gigantic plant-eating sauropods to the quick meat-eating tyrannosaurs. So far, the remains of over 1,000 different dinosaur species have been identified from fossils the extinction of most dinosaurs species occurred in the Cretaceous-Tertiary Extinction event. Fossil records show that birds evolved within the Theropod dinosaurs during the Jurassic period. Some birds survived the Cretaceous-Tertiary Extinction event from which modern birds
Homo erectus evolved into Homo sapiens and had dramatically smaller brains than us. Jared Diamond also states that there was another type of the same Genus called the Neanderthals. Homo neanderthalensis had brains larger than ours; they left behind strong evidence of burying their dead and caring for their sick, but still had crude stone tools with no recognizable function. Jared Diamond states that Human History “took off” around 50,000 years ago termed “The Great Leap Forward” with evidence of history’s first preserved jewelry. Fully modern skeletons of people termed “The Cro-Magnons” had used tools of bone.
The Search for Bigfoot Demetrius Brown Excelsior University Writing for Professions ENG 201 BK Harvey December 4, 2012 Abstract The most well-known creature and likely the most sought after one in and out of crypto zoological circles has to be Bigfoot also known as Sasquatch. Bigfoot has become a historical legend dating back centuries and is one of the most debated creatures as to its existence. There have been accounts and sightings of this mysterious creature from areas all around the world especially the Pacific Northwestern region of the US and Canada. Sightings and reports of Bigfoot have been around for centuries and have continued to be reported up to present day. Sightings of the creature have also offered varying articles
What lead to their extinction will be discussed in this case study. As can be seen from the geological time scale above the dinosaurs existed for around 230 million years then 65 MYA they just simply disappeared, Dinosaurs first appeared during the Triassic period, around 230 MYA these very quickly become the dominant terrestrial vertebrates for 135 million years, from the beginning of the Jurassic right through to their extinction in the Cretaceous period. However, there is evidence in the fossil record that shows some birds survived the extinction event that occurred 65 MYA, and they continue the dinosaur’s lineage today. Scientific Background The Triassic Period The Triassic Period is the first period of the Mesozoic Era, the Triassic period is also referred to as a time to grow new species to repopulate the planet. This time was the new era known as the Mesozoic Era, Geologists call it a new era because the life supported on the continents was so different from that of life during the Palaeozoic era.
The Arthropod I chose to research is Scorpions. Scorpions are a member of the Arachnida class. They are closely related to spiders, mites, and ticks which are multicellular, eukaryotes, have an exoskeleton made of chitin, and have jointed appendages. These insects have been around for hundreds of years. There are almost 2,000 scorpion species, but only 30 or 40 have strong enough poison to actually be able to kill a person.
Millions of years ago, reptiles lived in swamps and were very small, oversized by amphibians. After important extinction events, amphibians were devastated; reptiles adapted to living in drier conditions, and became carnivorous and herbivorous. The weaknesses that amphibians had were fixed in reptiles through evolution many years ago. During the Mesozoic Age, there was a wide diversity of reptiles and they dominated other species. Reptiles were the rulers of the world for a long time until mammals were