Amphibians were the first tetrapod vertebrates as well as the first vertebrates to live on land. During this interval, this lineage of fleshy-finned organisms moved from the water to the land. • Many parts of the skeleton changed as new innovations that permitted life on land evolved. For example, the ancestors lived fully in the water and had skulls that were tall and narrow, with eyes facing sideways and forwards. This allowed them to look around in their watery environments for predators and prey. However, as ancestors of the first tetrapods began to live in shallower waters, their skulls evolved to be flatter, with eyes on the tops of their heads. This probably allowed them to look up to spot food. Then, as tetrapods finally moved fully
Velociraptor was a mid-sized dromaeosaurid, with adults measuring up to 2.07 m (6.8 ft) long, 0.5 m (1.6 ft) high at the hip, and weighing up to 15 kg (33 lb).[3] The skull, which grew up to 25 cm (10 in) long, was uniquely up-curved, concave on the upper surface and convex on the lower. The jaws were lined with 26–28 widely spaced teeth on each side, each more strongly serrated on the back edge than the front.[1][4]
Scenario 1: According to the FASB, all debts of large amounts where turnover is quick that are due on demand are to be considered to qualify for net basis recording in the financing activities sectionv. As the agreement specifies that payment is due on demand, the turnover on the cash receipts from borrowing will be quicker (within three months). The line item on the statement of cash flows will be presented in the following manner on a net basis.
There are several major trends that developed in the vertebrate group that has allowed the transition from aquatic to terrestrial life. Some of these trends are improved respiration, protective body covering, and more efficient ways to reproduce. The adaptations that have allowed the transition from aquatic to terrestrial life are: Jaws, lungs, jointed vertebrate limbs, water tight skin, amniotic egg for reproduction. In birds and mammals another adaptation that has evolved is that they are endothermic meaning they generate internal heat.
Examination of the fossils and the strata in which they were found and compilation of this data into what is known as the fossil record provides a comprehensive picture of the morphology and physiology of the organism, how they evolved over time and even of the terrain and vegetation cover at that time period. Lower strata
The fossil of Tiktaalik confirmed a major prediction of paleontology in that it showed characteristics of both aquatic animals, such as fish, and land animals, such as reptiles and amphibians. While it had fins and scales, it also had a flexible neck, a flat head, and complex bone structure in its fins that correspond with the structure of the legs of terrestrial animals. Thus, it demonstrates the evolutionary transition between aquatic and terrestrial life.
Certain types of large snakes, in particular boas and pythons, and cetaceans, whales and dolphins, are shown to have homologous hip bones, a pelvis and femur. These bones have previously been considered vestigial--organ or body part which became redundant through the course of evolution--, but upon further research, have shown to serve a purpose.
Jaws are believed to evolved from the first pair of gill arches. The presence of jaws permits a predatory lifestyle. Early bony fishes or lobed finned fishes had lungs.
3. What are the major evolutionary trends that developed among major vertebrate groups, specifically those that allowed for the transition from aquatic to terrestrial life? All vertebrate groups go through developmental changes to become adults. There is one animal, the frog that has the incredible ability to start life only living in the water to being able to be both aquatic and terrestrial. Frogs first start out as tadpoles, only able to live in the water and feed on plankton.
Did you know that you share the same genetics as a mouse, or what about a fruit fly, and also a chimpanzee? In this paper I will be talking about how we share the same genes, and what the percentage is o the same genes we share with the 7 model organisms. I will also be telling important information on why we are related and how this all came to be.
One strategy I witnessed occurred on page 176 in The Merchants of Doubt. John Perry, who was the chief staff officer for the Academy Climate Research Board brought attention to the seemingly obvious concept which is that if doubling CO2 results in devastating ways then why do people just stop their thinking there1? His quote was “If we have a good reason to believe that a 100 percent increase in carbon dioxide will produce significant impacts on climate, then we must have equally good reason to suspect that even the small increase we have already produced may have subtly altered our climate.2” To be perfectly clear, the denial is not what Perry said but rather what he brought attention to. His thoughts on the subject were sensible because we won’t see monumental alterations until we near doubling the levels of CO2
Vertebrates are known to be animals with backbones. Tooth reduction is one of the major evolutionary trends that developed among major vertebrate groups that allowed for the transition from aquatic to terrestrial life. Evolution of limbs and being able to breath air are other evolutionary trends that took placeThese trends include improved respiration and protective and insulating body coverings. More over the transition from water to land also included changing to more efficient reproductive methods like having a placenta for some animals or egg layers for other animals. Lastly, the morphology of organisms evolved such that for land they would have paired, muscular appendages used for crawling and
Fossils provide a record of how organisms have evolved overtime, as they contain the remains of life trapped in sediment, ice or amber and preserved for over millions of years. Transitional fossils, which provide evidence for evolutionary change, have features that show the transition of characteristics of organisms from ancestors to descendents. An example is Archaeopteryx, which featured reptilian features, including teeth and skeleton, however, also had feathers and a wishbone sternum (used to attach muscles for flying). The evidence of the fossil shows the evolutionary transition between dinosaurs and
When you type drugs into Google, you get first, a website that tells about all the different types of drugs someone could want. Second, you get articles about how drugs are messing with everyday life. Today’s culture, people like to joke about the topic of drugs like it’s no big deal, but in reality, drugs continuously keep being a problem for Americans and keep growing into a bigger one. It is disgusting to see how many drugs are ruining so many people’s lives and making America gross while doing it. It makes one wonder, what would America be like with fewer drugs? If there were fewer drugs in America, the crime rate would decrease, there would be fewer deaths and people would live happier healthier lives. With better education on drugs, the crime rate would decrease making America better.
Scientists say reptiles evolved from amphibians 340 million years ago. The first reptile was an insect eater. Reptiles were more adaptable and able to
During the middle to late Eocene and into the Oligocene epoch several other members of the equids, with distinct evolutionary changes, existed including the Orohippus, Epihippus, Mesohippus, and Miohippus. The Orohippus developed from the Hyracotherium and shared many of the same traits. One major change was that the first and second toes disappeared. Another significant change occurred in the teeth. The last premolar changed to become like a grinding molar. Also the crests were more defined showing that the Orohippus’s diet had changed to a tougher plant material. During the middle Eocene a descendant of Orohippus appeared. The Epihippus still resembled a dog-like animal. It had four padded toes on the front leg, and three on the back leg. However, the teeth changed more drastically with two of the premolars changing to grinding molars. Now there were five grinding cheek teeth with low crowns. As