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uintatherium plesiadapis ans hyracotherium

uintatherium plesiadapis ans hyracotherium

Plesiadapis is one of the oldest known primate-like mammal species which existed about 60 mya in Asia, Africa and South America. It looked a little like a squirrel. Plesiadapis still had claws and its eyes were located on each side of the head, making them faster on the ground than on the top of the trees, but they begin to spend long times on lower branches of trees, feeding on fruits and leafs.

Source: http://www.answers.com/plesiadapis?gwp=11&ver=2.3.0.609&method=3

Animals such as PROCOPTODON,DIPROTODON,TOXODON,MAMMUTHUS,DEINOTHERIUM,COELODONTA lived in the quaternary period.Plants such as BIRCH,SWEETGUM lived in the quaternary period, as well as the plants and animals you see around you.

The primate lineage is thought go back to at least 65 mya, even though the oldest known primate from the fossil record is Plesiadapis (55-58 mya) from the Late Paleocene. Other studies, including molecular clock studies, have estimated the origin of the primate branch to have been in the mid-Cretaceous period, around 85 mya.

The last common ancestor between Homo sapiens and their closest relatives among other apes (Chimpanzees) occurred around 6 to 8 million years ago. Because this field is such a new one, and because the information is so limited, as of yet it is difficult to assign a specific species to the common ancestor. Right now the closest we have come is Sahelanthropus tchadensis.

There are two camps on this issue. One is based on scientific theory and the other is based on religious beliefs.

Science states that humans evolved over hundreds millions of years starting from simple celled organisms living in the water to more complex celled structures (animals). Evolution is a biological act. Science states that humanoids can be traced to 65 million years ago to a mammal named the Plesiadapis who evolved into many mammals including homo sapiens sapiens (not an error when I listed sapiens twice), or the humans.

Religious doctrines believe that on the 6th day of creation, man was created in God's own image some 6,000 years ago as described in the book of Genesis.

Some examples of tertiary consumers include birds of prey (e.g. hawks, eagles), large fish (e.g. tuna, swordfish), and carnivorous mammals (e.g. wolves, big cats). These animals prey on secondary consumers, such as small mammals and fish, forming an important part of the ecosystem's food chain.

The taxonomic grade "Prosimii" (prosimians) is no longer considered phylogenetically valid, it's a paraphyletic grouping of primates that are "neither monkeys nor apes". However, it is entirely possible that early primates lived during the Cretaceous, the last epoch of the Mesozoic, when dinosaurs ruled the Earth. No fossils have been found (some questionable material belonging to an early plesiadapiform Purgatorius has been attributed as Cretaceous in origin, but it's possible that this material was accidentally re-buried in a Cretaceous stratum at a later date). The earliest definite primate known from the fossil record is Plesiadapis, which lived some 55 million years ago, 10 million years after the dinosaurs went extinct. However, molecular clock studies indicate that the primate order may have arisen 85 million years ago, during the Late Cretaceous. Certainly, primate ancestors were alive at this time, though whether they could be placed in the order Primates is still an open question. It is very likely that if you were to see one of these early primates/primate ancestors today, you would think it was some strange kind of shrew, rather than a primate as such, since they did not yet physically resemble the monkeys, apes or even lemurs of later epochs.

One day

Pterosaurs died out 65.5 million years ago during the same cataclysmic event that wiped out the non-avian dinosaurs and 75% of Earth's species. Most scientists believe that this event, the K-T Extinction, was the result of a 6 mile wide asteroid that smashed into the Yucatan Peninsula of Mexico, leaving a 100 mile wide crater. So much dust and ash was launched into the atmosphere that sunlight was blocked for months or years. This caused plants to die, and thus the animals that ate them also died. In turn, the carnivores starved, and that would have included the pterosaurs.

Answer2: That dinosaurs existed abundantly throughout the earth, in an ancient landscape long ago vanished, is obvious from the fossil record. But these amazing creatures, along with countless other animal and plant kinds, passed out of existence. As to just when these things took place, paleontologist D. A. Russell states: "Unfortunately, existing methods for measuring the duration of events that happened so long ago are relatively imprecise." Fossil record does not yield its secrets so easily and that no one on earth today really knows all the answers.

Listing some speculations as to what happened to them, Princeton scientist G. L. Jepson stated:

"Authors with varying competence have suggested that dinosaurs disappeared because the climate deteriorated . . . or that the diet did. . . . Other writers have put the blame on disease, parasites, . . . changes in the pressure or composition of the atmosphere, poison gases, volcanic dust, excessive oxygen from plants, meteorites, comets, gene pool drainage by little mammalian egg-eaters, . . . cosmic radiation, shift of Earth's rotational poles, floods, continental drift, . . . drainage of swamp and lake environments, sunspots."-The Riddle of the Dinosaur.

It is apparent from such speculation that scientists are not able, with any certainty, to answer the question: What happened to the dinosaurs?