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.
Her skeleton includes her skull, teeth, arms, hands, pelvis, legs, and feet. She stood at almost 4 feet tall and weighed about 110 pounds, similar in size to a chimpanzee. She had a short, broad pelvis with a long, curved spine like modern humans. She had long arms, short legs, and a relatively small, chimp-sized brain. Her upper arm bone was non weight-bearing, and her wrist and finger joints were highly flexible, unlike chimps and gorillas that have rigid joints for knuckle walking.
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.
(Beggerow, 2009) “A variety of archaeological finds illustrate sewing has been present for thousands of years. The Romans left elaborate traces of their sewing technology, especially thimbles and needles. Even earlier Stone Age finds, such as the excavations on the island of Öland at Alby, Sweden, reveal objects such as bone needle cases dating to 6000 BC. Ivory needles were also found dated to 30,000 years ago at the Kostenki site in Russia. The oldest needle in the world was made of bone, dated to Aurignacian and discovered in Potočka Zijalka cave in Eastern Karavanke, Slovenia.” (Foundation, 2012) “Native Americans were known to use sewing needles from natural sources.
Of the 206 bones in the adult human body, more than half (106) are in the hands and feet. The adult skeleton consists of the following bones: 28 skull bones (8 cranial, 14 facial, and 6 ear bones) The horseshoe-shaped hyoid bone of the neck which is the only bone that does not articulate (connect via a joint) to another bone 26 vertebrae (7 cervical or neck; 12 thoracic; 5 lumbar or loins; the sacrum, which is five fused vertebrae; and the coccyx, which is four fused vertebrae) 24 ribs plus the sternum or breastbone; the shoulder girdle (2 clavicles, the most frequently fractured bones in the body, and 2 scapulae) the pelvic bones (3 fused bones called the coxal bone, or Os Coxae) 30 bones in each of the arms and legs (a total of 120) a few partial bones, ranging from 8-18 in number, which are related to joints There are individual variations: for example, some people are born with an extra rib or lumbar vertebra and not everyone has Inca (sutural) bones. The functions of human skeleton Body Frame- The skeleton holds the body together. Attached to each bone are ligaments, muscle, sinew, organs, veins, and other body tissue. Without the skeleton, a body would be a messy pile of goo.
The Merychippus were developed around 17 million years ago. These showed the most drastic yet change from their ancestor the Eohippus. The Merychippus had three toes on its front legs, but only stood on the middle on which was much larger than the other two. The two sides toes weren’t used for standing at all, as they didn’t touch the ground. The Merychippus was also tallest yet, reaching 40 inches.
One piece of evidence from an ice age shows us that continental drift actually happened. One of the Earth’s ice ages is called Permo Carboniferous, It’s large glacial sediments had covered many countries. These glacial sediments covered South America, Africa, Madagascar, Arabia, India, Antarctica, and Australia. Permo Carboniferous happened about two hundred and fifty million years ago and was discovered by A.G. Smith in 1997. This is important, because these continents could not all have been frozen while they were apart.
The Era is made up of six Geologic periods, the Cambrian, Ordovician, Silurian, Devonian, Carboniferous, and the Permian. Much of the plants and animals that exististed and evolved was due to the climate and location of the continents. At the beginning of the Paleozoic period, the continents were far apart, but by the end they were close together and on the way in forming the supercontinent called Pangaea. The land was moving by Plate Tectonics. Four hundred and thirty million years ago there was glaciation; this caused an ice sheet to cover what is now North Africa.
1)Machu Picchu is a Inca city that is located above about 8,000 sea level on a Andean Mountain ridge. 2)It was believed to have been made around the 15th century, until rediscovered by Hiram Bingham in 1911. No one is certain why it was built, some theories include: religious meaning, agriculture experimentation or a to the Incas gods. There are two areas to machu picchu, a urban section and a agracultural area. 5) Many of the rocks used to form Machu Picchu weigh up to 50 tons but have been sculpted to fit together so perfectly, that you can not even insert a knife blade.
There are almost 2,000 scorpion species, but only 30 or 40 have strong enough poison to actually be able to kill a person. The size of a Scorpion has been compared to the size of a tea cups. They can range from 2.5 in to 8.3 in. The body of the scorpion is divided into two parts, the cephlothorax, and the abdomen. The cephalothorax is the scorpions head made up of the eyes, mouth, pedipalps (claws) and four legs.