By touch they feel slippery and sticky. Their mucous like skin is so thin because, even though they have lungs, they absorb oxygen through their pores. They usually are unable to grown larger than the length of a man’s arm. However, reptiles can easily match the size and height of a man. Reptiles have a rough brittle exterior made from scales to protect the delicate skin that lies beneath, which makes them less susceptible to predators.
One important discovery Shubin made is Tiktaalik, which is a 375 million year old fossil. Tiktaalik is a fish that has scales and gills, but its head is flattened like that of a crocodile. Like most fish, Tiktaalik’s fins have ray bones enabling them to paddle in water, but the most amazing thing about it is that it has interior bones which allows it to lift off of the sea floor, something unordinary for a typical fish. It would use its limbs for support like a tetrapod. Shubin shows how fin structures of fish like Tiktaalik mark the beginning of the evolution into the mammalian paw and opposable thumb structures in the hands of today’s primates.
It had long legs and it a wide skull with lots of power in its bite. Albertosaurus is considered by many scientists to be the best known of the tyrannosaurs. A number of nearly complete skeletons, two adults and a juvenile, have been found. There are two recognized species and several in dispute. It is sometimes referenced as a transitory animal, a creature on its way to evolving into T. rex, but it appears that it was extremely successful and longer lived than the Tyrannosaurus
deep) off the coasts of the Gulf of Mexico all the way down to Brazil, in the Amazonian River Basins, around the islands of Cuba, Haiti and Puerto Rico, as well as along the central west and east coasts of Africa, up the Nile and down to Madagascar. The West Indian/Florida manatees currently inhabit the warm sub-tropical waters along the coast of Florida (as far north as the Carolinas and west along the coast of Louisiana and Texas). Though their range is quite large, manatees today exist in only a few small populations due to centuries of hunting them for meat and hides, coastal development and boating, and environmental changes. It is currently estimated that there are only about 2,200 manatees remaining in the US. They have no natural enemies except man and power boats which are responsible for most manatee deaths- (in 1990, 218 manatees or 12 % of the total population were killed by boats), though the red tide (toxins released from the bloom of dinoflagellates) of 1982 and1996 killed over 15% of the population.
Bradley brobst English II 12/14/09 Is the mega shark real or myth? Too many people believe that the megladon (mega shark) is not real, but the people have not seen the evidence of this horrific creature. There have been many sightings, photos, and some sort of video that can be plausible. Many bones of the great shark have been found of the shark. The shark is to be said that the length of the shark is about four times the size of a full size great white shark and about the width of a car.
Zach Torres Oceanography T/TH 11-15-10 Great White Shark For many years there has been one animal that has struck fear in everyone that goes into the ocean. That animal is the Great White Shark. It has been known to exceed 20 feet in length, although most are about 5 meters long and weigh somewhere between 4000 and 5000 pounds. They live in almost all coastal areas that have a water temperature that stay between about 50 and 75 degrees. Perhaps the most well known place to see great whites is Dyer Island, which is off the coast of South Africa.
11-25-2012 The Invasiveness and in Depth Information of Reptiles in the United States of America Andy Abstract Reptiles originated around 320-310 million years ago during the Carboniferous period, having evolved from advanced reptile-like amphibians that became increasingly adapted to life on dry land. Invasive species are a large problem in the United States. Biological invasions can result in numerous harmful impacts on the environment and species. Nile monitor lizards (Varanus niloticus), Burmese Pythons (Python Molurus Bivittatus) and Brown Tree Snakes (Boiga Irregularis), have become established southern Florida. All of these animals are very large, with abilities to adapt to a new location and reproduce at an alarming rate, these
The name water flea comes from its salutatory swimming style. The reason we used Daphnia in this type of experiment is due to the fact that the Daphnia is cheap and is very responsive to the variations in water. The transparency of the daphnia makes it easy to study the effect of temperature on the heart rate. Epinephrine also known as Adrenalin which is derived from Latin roots meaning kidney and the first naturally produced hormone to be isolated in a pure state. Epinephrine is a hormone that is secreted by the adrenal medulla in response to stress and increases heart rate, pulse rate, and
Slow twitch are characterized by having long contraction rates, being resistant to fatigue, relying on oxygen as their main source of metabolism, and are used primarily in endurance type of activities that don't require a great deal of force. Fast twitch fibers on the other hand have short but powerful contraction rates, are highly fatigable due to their reliance on anaerobic metabolism that produces lactic acid, and are more suited to activities that are powerful and quick in duration. So the next time you are watching or participating in an athletic event, try and think of what type of muscle cells are involved and see if you can pick out which athletes have a predominance of that muscle type in their
Horseshoe Crabs Despite its common name, the horseshoe crab is more closely related to spiders and scorpions than crabs. All are invertebrates from the phylum Arthropods, or arthropods. This group of animals includes insect’s spiders, scorpions, ticks and mites crabs, lobsters, shrimp and barnacles and the 4 world-wide species of horseshoe crabs. Horseshoe crabs are one of the world’s oldest animals. For over 300 million years (at least 100 million years before there were dinosaurs on earth) horseshoe crabs have survived and remained fairly unchanged.